Product FAQ
KR2202
Question 01. Why can my remote control Relay 1 but not Relay 2?
Answer:
The most common reason is that Relay 2 has not been paired with a remote button yet.
KR2202 has two relay channels. Pairing one button only sets one relay channel. To control Relay 2, you need to pair another remote button in the same learning flow.
For Momentary mode:
- Press the Learning button 1 time.
- Press the button for Relay 1 and wait until the indicator light flashes and turns off.
- Press the button for Relay 2 and wait until the indicator light flashes and turns on.
If only Relay 1 works, reset the receiver and pair both buttons again.
Question 02. Why do both A and B buttons control Relay 1 only after KR2202 Momentary pairing?
Answer:
This is usually a pairing issue, not a defective receiver.
Re-pair the receiver with the steps below to fix it:
- Press the Learning button 8 times to reset.
- Press the Learning button 1 time for Momentary mode.
- Press button A and wait until the indicator light flashes and turns off.
- Press button B and wait until the indicator light flashes and turns on.
Do not stop after pairing only button A. KR2202 needs both buttons to finish the 2-channel setup.
Question 03. What is the difference between Momentary, Toggle, and Latching mode?
Answer:
KR2202 has three working modes, and each mode changes how the relay responds to the remote button.
- Momentary mode: the relay turns on only while you hold the button. When you release the button, the relay turns off.
- Toggle mode: press the same button once to turn the relay on, and press it again to turn the relay off.
- Latching mode: one button turns one relay on, another button turns the other relay on and turns the first relay off, and a stop button turns the active relay off.
Use Momentary mode for hold-to-run control, Toggle mode for simple on / off control, and Latching mode when two directions should not turn on at the same time.
Question 04. Do the two relay channels trigger at the same time or one by one?
Answer:
No, KR2202 does not have an automatic sequence mode.
The two relay channels are normally controlled separately by different remote buttons. In Momentary mode or Toggle mode, button A can control Relay 1 and button B can control Relay 2.
Question 05. How do I set two remotes to control Relay 1 and Relay 2 on KR2202?
Answer:
To set two remotes to control Relay 1 and Relay 2, pair one button from the first remote to Relay 1 and one button from the second remote to Relay 2 in the same learning flow.
Example for Toggle mode:
- Press the Learning button on the receiver 2 times.
- Wait until the indicator light turns off.
- Press the button on the first remote for Relay 1.
- Wait until the indicator light flashes and turns off.
- Press the button on the second remote for Relay 2.
- When the indicator light flashes and turns on, the setup is finished.
If the pairing is wrong, press the Learning button 8 times to reset. Reset will delete all paired remotes.
Question 06. Can I pair multiple remotes to channels A and B in Momentary mode?
Answer:
Yes. KR2202 can pair multiple remotes to channels A and B in Momentary mode.
For each new remote, pair both buttons in the Momentary learning flow. Do not pair only button A.
Do not press the Learning button 8 times unless you want to reset the receiver, because 8 presses delete all paired remotes.
Question 07. Why does a 3-button UP / STOP / DOWN remote not work for motor control in Toggle mode?
Answer:
It fails because Toggle mode is not the right mode for UP / STOP / DOWN motor control. Use Latching mode instead.
The key step is pairing UP and DOWN in the same Latching mode learning flow:
- Reset the receiver if the old pairing is wrong.
- Press the Learning button 3 times to enter Latching mode.
- Press UP first, then wait until the indicator light flashes and turns off.
- Press DOWN next, then wait until the indicator light flashes and turns on.
After this setup, UP runs the motor up, DOWN runs the motor down and turns UP off, and STOP turns the active relay off. For motor control, make sure the up and down directions cannot turn on at the same time.
Question 08. How do I use KR2202 Momentary mode to control a two-direction motor with button A and button B?
Answer:
Yes. You can use KR2202 Momentary mode for a two-direction motor with button A and button B.
Steps:
- Press the Learning button on the receiver 1 time.
- Wait until the indicator light turns off.
- Press button A on the remote.
- Wait until the indicator light flashes and turns off.
- Press button B on the remote.
- When the indicator light flashes and turns on, the setup is finished.
In Momentary mode, the relay turns on only while you hold the button. For a two-direction motor, both directions must not turn on at the same time.
If the motor system has a dedicated control input, trigger the control input with KR2402A instead of switching the motor power wires directly.
If the motor system has a dedicated control input, trigger the control input with KR2202 instead of switching the motor power wires directly.
Question 09. Does the KR2202 relay stay on after power loss?
Answer:
No. The relay cannot stay on when the power is off.
KR2202 can remember the paired remote and working mode after power loss. But the relay state needs power. After power comes back, the next relay action depends on the mode and remote command.
Question 10. Is the KR2202 receiver powered by 220V, or are the relay contacts rated for 220V?
Answer:
Yes, the KR2202 receiver can be powered by 220V AC. But the relay contacts do not output 220V by themselves.
The relay output is a dry contact. The NO / COM / NC terminals work like a switch for the circuit you connect.
Question 11. Is KR2202 compatible with 230V AC?
Answer:
Yes. KR2202 can work with 230V AC power.
Its input voltage range is AC 85V-250V, so 230V AC is within the supported power range.
Question 12. How should I wire KR2202 for my load?
Answer:
It depends on what load you want to control.
Use the wiring diagram that matches your load, such as a motor, lamp, or other device. Turn off power before wiring. For AC power wiring, do not reverse L and N, and keep the load within Max 1100W.
L and N power the KR2202 receiver itself. The relay terminals do not output power by themselves; they are dry contacts and work like switches for the load circuit you connect.
Question 13. Can one KR2202 remote control two garage door motors?
Answer:
It depends on what you mean by garage door motor.
If you mean a normal garage door opener or controller input, yes. KR2202 can work like a dry contact switch signal, similar to pressing a wall button.
Do not use KR2202 to directly drive bare garage door motors. KR2202 is a relay receiver, not a garage door motor controller.
Question 14. Can KR2202 control a winch raise and lower motor?
Answer:
Yes, for some winch raise / lower systems, but only if the winch motor matches KR2202.
Check the motor voltage, running current, and starting current first. KR2202 input is AC 85V-250V, and the rated load is Max 1100W. For raise / lower control, the up and down directions must not turn on at the same time.
Question 15. Is KR2202 suitable for a roller shutter or garage shutter motor?
Answer:
Yes, KR2202 can be used for some roller shutter or garage shutter motors.
Key points:
- The shutter motor or controller must match KR2202 power and load limits: AC 85V-250V input and Max 1100W load.
- Momentary mode is usually a good choice because the motor runs only while you hold the remote button.
- If the shutter has a manual wall switch, connect KR2202 relay output COM and NO in parallel with the two terminals of the manual switch to add remote control.
Question 16. Can KR2202 use button A and button B for gate open and close in Momentary mode?
Answer:
Yes, if your gate controller has dry contact OPEN and CLOSE inputs.
Use Relay 1 for OPEN and Relay 2 for CLOSE. Set KR2202 to Momentary mode if you want the command to work only while you hold the button. Do not connect KR2202 to terminals that are not made for dry contact input.
Question 17. How do I identify a 3-wire roller shutter motor, and does KR2202 stop at the end position?
Answer:
No, do not assume the third wire is ground. Also, KR2202 does not stop the shutter at the end position by itself.
A 3-wire shutter motor may be Live / Neutral / Ground, or it may be Common / Up / Down. Check the motor label, wiring diagram, or controller manual before wiring. KR2202 only turns the relay on and off; the shutter motor or controller must have its own limit switch or end stop.
Question 18. Why does KR2202 work with no load but fail when I connect a pool cover motor?
Answer:
If KR2202 works with no load but fails when you connect the pool cover motor, KR2202 is probably not the broken part. The problem is usually the motor load or the motor control method.
The two most likely reasons are:
-
The motor starting current is too high. A motor needs much more current when it starts than when it is running. Even if the motor running power is under Max 1100W, the starting current may still be too high for KR2202. In this case, do not use KR2202 to switch the motor power directly. Use a proper motor controller or contactor, or confirm that the starting current is within the KR2202 limit.
-
The pool cover motor may need its own control input. KR2202 is a relay receiver, not a motor controller. It only works like a switch through NO and COM. If the pool cover system has a wall switch or control input, use KR2202 to trigger that input instead of directly switching the motor power wires.
Check the motor label or controller manual for starting current and control input type. If you are not sure, ask an electrician to check it before wiring.
Question 19. Can one remote control two KR2202 receivers in Momentary mode and Toggle mode?
Answer:
Yes, it is possible, but we do not recommend it if the two KR2202 receivers are close to each other.
One remote sends the same RF signal. If both receivers are within range, both may receive the signal and operate. To avoid interference, keep the two receivers far enough apart so they are not in the same remote-control range, or use separate remotes.
Question 20. Can I add a signal amplifier to KR2202 to reach 100 meters?
Answer:
No, we do not recommend adding a signal amplifier to KR2202.
KR2202 uses 433.92MHz remote control. To improve distance, fully extend the receiver antenna and keep it away from metal and motors. If you need about 100 meters, use a longer-range remote with an antenna instead of modifying the receiver.
KR2402A
Question 01. Why can my remote control Relay 1 but not Relay 2?
Answer:
The most common reason is that Relay 2 has not been paired with a remote button yet.
KR2402A has two relay channels. Pairing one button only sets one relay channel. To control Relay 2, you need to pair another remote button in the same learning flow.
For Momentary mode:
- Press the Learning button 1 time.
- Press the button for Relay 1 and wait until the indicator light flashes and turns off.
- Press the button for Relay 2 and wait until the indicator light flashes and turns on.
If only Relay 1 works, reset the receiver and pair both buttons again.
Question 02. Why do both A and B buttons control Relay 1 only after KR2402A Momentary pairing?
Answer:
This is usually a pairing issue, not a defective receiver.
Re-pair the receiver with the steps below to fix it:
- Press the Learning button 8 times to reset.
- Press the Learning button 1 time for Momentary mode.
- Press button A and wait until the indicator light flashes and turns off.
- Press button B and wait until the indicator light flashes and turns on.
Do not stop after pairing only button A. KR2402A needs both buttons to finish the 2-channel setup.
Question 03. What is the difference between Momentary, Toggle, and Latching mode?
Answer:
KR2402A has three working modes, and each mode changes how the relay responds to the remote button.
- Momentary mode: the relay turns on only while you hold the button. When you release the button, the relay turns off.
- Toggle mode: press the same button once to turn the relay on, and press it again to turn the relay off.
- Latching mode: one button turns Relay 1 on, and another button turns Relay 2 on while Relay 1 turns off.
Use Momentary mode for hold-to-run control, Toggle mode for simple on / off control, and Latching mode when Relay 1 and Relay 2 should not stay on at the same time.
Question 04. Do the two relay channels trigger at the same time or one by one?
Answer:
No, KR2402A does not have an automatic sequence mode.
The two relay channels are normally controlled separately by different remote buttons. In Momentary mode or Toggle mode, button A can control Relay 1 and button B can control Relay 2.
Question 05. How do I set two remotes to control Relay 1 and Relay 2 on KR2402A?
Answer:
To set two remotes to control Relay 1 and Relay 2, pair one button from the first remote to Relay 1 and one button from the second remote to Relay 2 in the same learning flow.
Example for Toggle mode:
- Press the Learning button on the receiver 2 times.
- Wait until the indicator light turns off.
- Press the button on the first remote for Relay 1.
- Wait until the indicator light flashes and turns off.
- Press the button on the second remote for Relay 2.
- When the indicator light flashes and turns on, the setup is finished.
If the pairing is wrong, press the Learning button 8 times to reset. Reset will delete all paired remotes.
Question 06. Can I pair multiple remotes to channels A and B in Momentary mode?
Answer:
Yes. KR2402A can pair multiple remotes to channels A and B in Momentary mode.
For each new remote, pair both buttons in the Momentary learning flow. Do not pair only button A.
Do not press the Learning button 8 times unless you want to reset the receiver, because 8 presses delete all paired remotes.
Question 07. How do I use KR2402A Momentary mode to control a two-direction motor with button A and button B?
Answer:
Yes. You can use KR2402A Momentary mode for a two-direction motor with button A and button B.
Steps:
- Press the Learning button on the receiver 1 time.
- Wait until the indicator light turns off.
- Press button A on the remote.
- Wait until the indicator light flashes and turns off.
- Press button B on the remote.
- When the indicator light flashes and turns on, the setup is finished.
In Momentary mode, the relay turns on only while you hold the button. For a two-direction motor, both directions must not turn on at the same time.
Question 08. Does the KR2402A relay stay on after power loss?
Answer:
No. The relay cannot stay on when the power is off.
KR2402A can remember the paired remote and working mode after power loss. But the relay state needs power. After power comes back, the next relay action depends on the mode and remote command.
Question 09. How should I wire KR2402A for my load?
Answer:
It depends on what load you want to control.
Use the wiring diagram that matches your load, such as a lamp, AC motor, or DC motor. Turn off power before wiring. KR2402A receiver input is DC 5V-60V through +V and -V. For relay output wiring, use the correct relay terminals: NO1 / COM1 / NC1 for Relay 1, and NO2 / COM2 / NC2 for Relay 2.
+V and -V power the KR2402A receiver itself. The relay terminals do not output power by themselves; they are dry contacts and work like switches for the load circuit you connect.
Question 10. Can one remote control two KR2402A receivers in Momentary mode and Toggle mode?
Answer:
Yes, it is possible, but we do not recommend it if the two KR2402A receivers are close to each other.
One remote sends the same RF signal. If both receivers are within range, both may receive the signal and operate. To avoid interference, keep the two receivers far enough apart so they are not in the same remote-control range, or use separate remotes.
Question 11. Can I add a signal amplifier to KR2402A to reach 100 meters?
Answer:
No, we do not recommend adding a signal amplifier to KR2402A.
KR2402A uses 433.92MHz remote control. To improve distance, fully extend the receiver antenna and keep it away from metal and motors. If you need about 100 meters, use a longer-range remote with an antenna instead of modifying the receiver.
KR1201A
Question 01. Does KR1201A support momentary mode?
Answer:
Yes. KR1201A supports momentary mode. In momentary mode, the relay is activated only while the remote button is pressed. When the button is released, the relay turns off.
KR1201A also supports other working modes, such as self-locking mode and interlocking mode. Select the mode according to your application.
Question 02. What happens in momentary mode if the remote moves out of signal range while the button is being held?
Answer:
In momentary mode, moving the remote out of signal range is equivalent to releasing the remote button. The relay will turn off when the receiver no longer receives the signal.
Question 03. Which mode should I use if I want to reduce battery consumption?
Answer:
The receiver consumes a small amount of power while in standby as long as it is connected to power. Momentary mode can reduce the active working time, which may help extend battery life in some applications.
For longer operating time, use a suitable large-capacity battery or a stable 12V DC power supply.
Question 04. Will KR1201A lose the paired remote controls or working mode after power loss?
Answer:
No. KR1201A has memory function. After the remote controls and working mode are correctly paired and set, they will not be lost when the power is disconnected.
After power is restored, the receiver can continue working with the previously saved remote controls and mode, unless the receiver has been reset.
Question 05. Does toggle mode need to be set again after power loss?
Answer:
No. If KR1201A has been set to toggle mode, the receiver will remember this mode after power loss. It does not need to be paired or programmed again after power is restored.
Question 06. Can one KR1201A receiver be paired with more than one remote control?
Answer:
Yes. One KR1201A receiver can be paired with multiple remote controls. Pair the first remote control, then repeat the pairing operation for the additional remote controls.
The paired remote controls can operate the same receiver independently.
Question 07. Can two remote controls use the same working mode, such as delay mode or toggle mode?
Answer:
Yes. Multiple remote controls can be paired with the same receiver and used with the same working mode, such as delay mode or toggle mode.
Question 08. Can KR1201A reverse a DC motor?
Answer:
No. KR1201A is a single-channel relay receiver. It supports simple on/off control and cannot reverse a DC motor directly.
Reversing a DC motor requires switching the positive and negative terminals of the motor, which normally requires at least a two-channel relay controller or a dedicated motor controller.
Question 09. Can button B be used to reverse a motor?
Answer:
Not with KR1201A alone. KR1201A is a single-channel controller and cannot provide forward and reverse motor control.
For motor forward and reverse control, use a suitable two-channel controller, such as a controller designed for DC motor or linear actuator control.
Question 10. Can KR1201A control a servo motor?
Answer:
KR1201A is not designed for precise servo motor control. Servo motors usually require signal-based control from a suitable servo controller or programmable controller.
If you only need simple motor forward and reverse operation, use a suitable motor controller instead of KR1201A.
Question 11. Can two KR1201A receivers be used to control a DC motor left and right?
Answer:
KR1201A is not the recommended solution for DC motor direction control. For left and right, forward and reverse, or polarity-changing motor control, use a two-channel receiver or a dedicated motor controller.
Question 12. Can KR1201A be powered by AC power?
Answer:
No. KR1201A is a DC relay receiver and must not be connected directly to AC power.
Use a suitable DC power supply for KR1201A. If your application requires AC 110V or AC 220V control, choose a relay receiver designed for that AC voltage.
Question 13. Can KR1201A control AC 220V home appliances?
Answer:
KR1201A itself is a 12V DC receiver module. Do not power the module directly with AC 220V.
If you need to control AC 220V appliances, use a relay module designed for AC 220V applications, or use KR1201A only in a properly isolated control circuit designed by a qualified person.
Question 14. Can KR1201A and the load use the same power supply?
Answer:
They can use the same power supply only if the voltage and current ratings match the requirements of both the receiver and the load.
Check that:
- the receiver input voltage matches the power supply;
- the load voltage matches the same power supply;
- the power supply output current is sufficient for the receiver and load together.
If the voltage is incorrect or the current is insufficient, the device may not work properly or may be damaged.
Question 15. Can a 5V version work with a 3.7V Li-ion / 18650 battery?
Answer:
A 5V-rated receiver is designed to operate at 5V. A 3.7V Li-ion battery, such as an 18650 cell, is lower than the rated voltage.
It may cause unstable operation, reduced remote-control distance, or failure to work. For stable performance, use a proper 5V power source for a 5V receiver.
Question 16. What battery should be used for KR1201A?
Answer:
Use a suitable 12V power source for KR1201A. A 12V lithium battery can provide better power capacity than ordinary AA batteries.
Ordinary AA batteries may work if they provide the required voltage, but they usually have lower capacity and may run out quickly. If the device stops working, check whether the battery is drained or whether the receiver has been damaged.
Question 17. Can a 9V battery power KR1201A?
Answer:
No. KR1201A is designed for 12V DC power. A 9V battery may light the indicator but may not provide enough voltage for the relay to work correctly.
Use a proper 12V power source within the specified operating range.
Question 18. Can two devices be connected using NO and NC?
Answer:
Yes. The NO and NC terminals can be used according to the relay logic. NO is normally open, and NC is normally closed.
For example, one load can be connected through NO and another load through NC, so one load is on while the other is off. Make sure the wiring matches the load type and power supply, and avoid short circuits.
Question 19. Can the negative line be connected to COM for triggering?
Answer:
In many wiring diagrams, the positive line is connected to COM. However, if you understand the relay principle, the negative line can also be connected to COM in some DC circuits.
The key rule is that the circuit must not create a short circuit before or after relay triggering.
Question 20. Can KR1201A control two LED lights so that one is on while the other is off?
Answer:
Yes, this can be done by using the NO and NC contacts of the relay.
One LED can be connected through the NO terminal, and the other LED can be connected through the NC terminal. When the relay changes state, one LED turns on and the other turns off.
For more complex multi-load control, a multi-channel relay receiver is recommended.
Question 21. What is the maximum remote-control distance?
Answer:
The actual remote-control distance depends on the remote model, antenna, installation environment, obstacles, and interference.
Some remotes may claim very long ranges, such as 2 miles or 3 km, but real-world performance can be much lower. In practical road-like testing, the distance may be around 1 km or less depending on conditions.
Question 22. Can an external antenna be connected?
Answer:
KR1201A has an antenna on the module. The antenna can be replaced for testing, but the replacement antenna must match the required specifications.
If the antenna impedance or design is not suitable, the distance may not improve and the module may perform poorly.
Question 23. How do I reset KR1201A?
Answer:
For QIACHIP KR1201A, reset is usually performed by pressing the learning button on the receiver 8 times.
After reset, previously paired remote controls and mode settings may be cleared. Pair the remote controls and set the working mode again after reset.
Question 24. Does KR1201A have memory storage, such as EEPROM?
Answer:
Yes. KR1201A has storage memory for paired remote controls and mode settings.
The module can store up to 20 remote controls.
Question 25. Can KR1201A be used for access control or automatic residential gates?
Answer:
KR1201A can provide dry contact control and may be used in some access-control applications.
Whether it can be used for an automatic residential gate depends on the gate controller's working principle, input requirements, and voltage. For AC 220V systems or higher-power applications, choose a suitable relay receiver designed for that system.