Air-to-Air Heat Pump Systems FAQ

• We recommend that you remove and clean the air filter every two weeks.

• After 240 hours of use the display on the head unit will flash a "CL" code. This is a reminder to clean the filter.

• Please refer to the Maintenance section of the product manual for the air filter removal and cleaning procedure.

Yes.

• If the air filter should be damaged at any point (during cleaning for example) it should be replaced with a new one.

• After 2,880 hours of use the display on the head unit will flash a "nF" code. The air filter should be replaced with a new one at this time.

• Please refer to the Maintenance section of the product manual for the air filter removal and replacement procedure.

• Check for damaged wiring.

• Check and clean air filters. If damage is found, replace the filter.

• Potential refrigerant leak. If leaking is evident please do not use the unit. We recommend that a qualified contractor be used to rectify the problem.

• Replace batteries in remote control.

• Ensure that nothing is blocking any air inlets and outlets, and that all grilles are clear of obstruction.

No, these two codes are triggered by automatic timers and are simply just reminders that it's time to carry out maintenance on the indoor head unit's air filter:

• "CL" - This is displayed every 240 hours of use and is a reminder to remove and clean the air filter.

• "nF" - This is displayed every 2,880 hours of use and is a reminder to replace the air filter with a new one.

Once you have taken the appropriate action based on which of the two codes is displayed, you must manually reset the code by doing the following:

• Press the "LED" button on your remote control 4 times, or press the "Manual Control" button 3 times.

• If the manual reset is not carried out, the code will continue to display every time you restart the unit.

The maximum length of line set that can be used between the outdoor unit and the indoor head unit depends on the specific model. For further information, please refer to the product manual .

An indoor head unit is designed to operate in one zone only (for example; A living room or a bedroom).

If you are looking to condition multiple rooms you can design a system that uses one outdoor unit that is paired to multiple indoor head units. Correct sizing and model choice for the application will be critical, so please refer to the product brochure for further details.

Yes, the indoor unit continuously circulates air as a way of determining the temperature of the room.

The fan will also speed up or down based on the settings that you have programmed.

This code may be caused by a supply voltage issue.

First thing to try is shut off the mains power supply to the equipment, wait for 10 minutes, and turn the power back on again. If the E2 is still displayed then the power supply should be tested by a qualified electrical contractor to ensure that it meets the requirements that are displayed on the rating label of the equipment.

Safety Notice - This is a high voltage product and contains refrigerant. Only professionals who are qualified to work on such equipment should do so.

You may occasionally see the P6/L0-L9 code shown on the outdoor unit's LED display, and the system will automatically restart after 6 minutes. However, if this happens 3 times within 60 minutes the unit will lock out on an H4 code.

In that event, the installer/service professional should:

  • Check that the service valves are open. If the valves were NOT open: Open the service valves, then power cycle the product and verify that it runs correctly. If the valves WERE open: Move to Step 2.
  • Check that the compressor wiring is correctly connected. If the compressor wiring was NOT correctly connected: Reset the connections in accordance with the wiring diagram, then power cycle the product and verify that it runs correctly. If the compressor wiring WAS correctly connected: Move to Step 3.
  • Check the compressor insulation resistance to ensure that is greater than 100kOhms. If the resistance is NOT greater than 100kOhms: Replace the compressor. If the resistance IS greater than 100kOhms: Move to Step 4.
  • Check that the resistance of the U/V/W terminals are normal. If the resistance is NOT normal: Replace the compressor. If the resistance IS normal: Move to Step 5.
  • Power cycle the unit and ensure that it's now running correctly. If the unit IS now operating correctly: Keep it running for at least 60 minutes to ensure that the H4 code no longer appears. If the unit continues to run correctly with no further H4 code after at least 60 minutes: The issue should now be resolved. If the H4 code continues to appears and the unit locks out: Replace the control board.

Safety Notice - This is a high voltage product and contains refrigerant. Only professionals who are qualified to work on such equipment should do so.

If you're experiencing a situation where the unit is not putting out heated or cooled air when needed, please follow these steps:

1.) Has your room thermostat been correctly setup to energize the heat pump's reversing valve in heat mode only?

  • No: Refer to your thermostat's instruction manual to ensure that it is programmed to energize the heat pump's reversing valve only in heating mode.
  • Yes: Move to Step 2.

2.) When calling for heat, the room thermostat should be sending 24v to terminals C and B on the outdoor unit's control board. Use your multimeter to test across terminals C and B on the control board while the thermostat is calling for heat.

  • If you are NOT getting 24v to C and B: Check the wiring between the thermostat and the heat pump, and correct any errors or damage that you may find. If you find no issues, then you may have a faulty, or incompatible, thermostat.
  • If you ARE getting 24v to C and B: Move to Step 3.

3.) When calling for cooling, the room thermostat should also be sending 24v to terminals C and Y on the outdoor unit's control board. Use your multimeter to test across terminals C and Y on the control board while the thermostat is calling for cooling.

  • If you are NOT getting 24v to C and Y: Check the wiring between the thermostat and the outdoor unit, and correct any errors or damage that you may find. If you find no issues, then you may have a faulty, or incompatible, thermostat.
  • If you ARE getting 24v to C and Y: Move to Step 4.

4.) Locate the "CHECK" button on the outdoor unit's control board, next to the LED display.

  • Press the button until the parameter "1" is shown on the display, then wait a second or so and the number will change automatically. This number shows which mode the outdoor unit is currently in:
    • "0" - Standby
    • "2" - Cooling
    • "3" - Heating
    • Therefore if the room thermostat is correctly set to energize the heat pump's reversing valve only in heat mode, and you have verified that the wiring is correct and that you are seeing 24v across terminals C and Y or across C and B on the outdoor unit's control board while the thermostat is calling for heating or cooling, the mode parameter shown on the display should be "2" for cooling or "3" for heating.
    • If this is not the case, and if either "0" or "2" is showing instead of "3", then the control board may be faulty or wiring could be incorrect.

Safety Notice - This is a high voltage product and contains refrigerant. Only professionals who are qualified to work on such equipment should do so.

If you have provided power to the outdoor unit but notice that the control board's LED display is blank, please follow these steps:

  • Use your multimeter to ensure that correct voltage is being supplied to the unit across the L1 and L2 terminals. This product requires a supply voltage that falls within 187vac to 253vac. If the supply voltage is NOT within the correct range: Investigate the electrical installation to the product and remedy any problems that may be found.
  • Check all fuses on the control board.
  • Remove power from the condenser and let it sit for 5 minutes. Unplug the pressure transducer, the condenser fan, and compressor U, V, W. Power up the unit:
    • If you now have a working LED display then one of the unplugged components is likely to be defective. You can plug them back in one at a time to try to determine who one is the problem.
    • If you still have no LED display after powering up the board with none of the above components plugged in, but all fuses are good, then the board is likely to be faulty and should be replaced.

1.) Your IDS product may be oversized for your application, which is resulting in the set temperature being satisfied faster that the moisture can be removed from the air. Please contact your installer to verify that the IDS model is sized appropriately for the application. Detailed information and specifications downloads for the product can be found toward the bottom of the IDS 1.0 product page or the IDS 2.0 product page .

2.) The ducting in your home may not be sized, or laid out, to provide correct airflow for the specific IDS model installed. Your installer should verify the static pressure.

3.) The room thermostat may be setup incorrectly. Please refer to the instructions for your model of thermostat to ensure that the “Run Cycles” is set to “1”.

4.) There may be an incompatibility with the thermostat that you are using. Some brands/models of thermostat interrupt the call for heat (or cooling) when they are charging. If your model of thermostat operates in such a way, then it may cause control issues with your heating and cooling equipment.

5.) Your contractor may need to work with our technical support teams to check certain readings (such as the charge level for super heat and sub cooling in force mode). If the product is sized correctly for the application, the ducting and static pressure is proven to be correct, and the thermostat is working correctly, then please have your contractor call our experts on 1-800-283-3787 (Monday – Friday 8am to 5pm) and we will be happy to assist further.

Safety Notice - This is a high voltage product and contains refrigerant. Only professionals who are qualified to work on such equipment should do so.

You may occasionally see the P6/L0-L9 code shown on the outdoor unit's LED display, and the system will automatically restart after 6 minutes. However, if this happens 3 times within 60 minutes the unit will lock out on an H4 code.

In that event, the installer/service professional should:

  • Check that the service valves are open.
    If the valves were NOT open: Open the service valves, then power cycle the product and verify that it runs correctly.
    If the valves WERE open: Move to Step 2.
  • Check that the compressor wiring is correctly connected.
    If the compressor wiring was NOT correctly connected: Reseat the connections in accordance with the wiring diagram, then power cycle the product and verify that it runs correctly.
    If the compressor wiring WAS correctly connected: Move to Step 3.
  • Check the compressor insulation resistance to ensure that is greater than 100kOhms.
    If the resistance is NOT greater than 100kOhms: Replace the compressor.
    If the resistance IS greater than 100kOhms: Move to Step 4.
  • Check that the resistance of the U/V/W terminals are normal.
    If the resistance is NOT normal: Replace the compressor.
    If the resistance IS normal: Move to Step 5.
  • Power cycle the unit and ensure that it's now running correctly.
    If the unit IS now operating correctly: Keep it running for at least 60 minutes to ensure that the H4 code no longer appears.
    If the unit continues to run correctly with no further H4 code after at least 60 minutes: The issue should now be resolved.
    If the H4 code continues to appears and the unit locks out: Replace the control board.

If you're experiencing a situation where the unit is not putting out heated or cooled air when needed, please follow these steps:

1. Has your room thermostat been correctly setup to energize the heat pump's reversing valve in heat mode only?

  • No: Refer to your thermostat's instruction manual to ensure that it is programmed to energize the heat pump's reversing valve only in heating mode.
  • Yes: Move to Step 2.

2. When calling for heat, the room thermostat should be sending 24v to terminals C and B on the outdoor unit's control board. Use your multimeter to test across terminals C and B on the control board while the thermostat is calling for heat.

  • If you are NOT getting 24v to C and B: Check the wiring between the thermostat and the heat pump, and correct any errors or damage that you may find. If you find no issues, then you may have a faulty, or incompatible, thermostat.
  • If you ARE getting 24v to C and B: Move to Step 3.

3. When calling for cooling, the room thermostat should also be sending 24v to terminals C and Y on the outdoor unit's control board. Use your multimeter to test across terminals C and Y on the control board while the thermostat is calling for cooling.

  • If you are NOT getting 24v to C and Y: Check the wiring between the thermostat and the outdoor unit, and correct any errors or damage that you may find. If you find no issues, then you may have a faulty, or incompatible, thermostat.
  • If you ARE getting 24v to C and Y: Move to Step 4.

Locate the "CHECK" button on the outdoor unit's control board, next to the LED display.

  • Press the button until the parameter "1" is shown on the display, then wait a second or so and the number will change automatically. This number shows which mode the outdoor unit is currently in:

    • "0" - Standby
    • "2" - Cooling
    • "3" - Heating
    • Therefore if the room thermostat is correctly set to energize the heat pump's reversing valve only in heat mode, and you have verified that the wiring is correct and that you are seeing 24v across terminals C and Y or across C and B on the outdoor unit's control board while the thermostat is calling for heating or cooling, the mode parameter shown on the display should be "2" for heating or "3" for cooling.
    • If this is not the case, and if either "0" or "2" is showing instead of "3", then the control board may be faulty or wiring could be incorrect.

Safety Notice - This is a high voltage product and contains refrigerant. Only professionals who are qualified to work on such equipment should do so.

If you have provided power to the outdoor unit but notice that the control board's LED display is blank, please follow these steps:

  • Use your multimeter to ensure that correct voltage is being supplied to the unit across the L1 and L2 terminals. This product requires a supply voltage that falls within 187vac to 253vac.
    If the supply voltage is NOT within the correct range: Investigate the electrical installation to the product and remedy any problems that may be found.
  • Check all fuses on the control board.
  • Remove power from the condenser and let it sit for 5 minutes.
    Unplug the pressure transducer, the condenser fan, and compressor U, V, W.
    Power up the unit:
    • If you now have a working LED display then one of the unplugged components is likely to be defective. You can plug them back in one at a time to try to determine who one is the problem.
    • If you still have no LED display after powering up the board with none of the above components plugged in, but all fuses are good, then the board is likely to be faulty and should be replaced.

1. Your IDS product may be oversized for your application, which is resulting in the set temperature being satisfied faster that the moisture can be removed from the air. Please contact your installer to verify that the IDS model is sized appropriately for the application. Detailed information and specifications downloads for the product can be found towards the bottom of this webpage ( IDS 2.0 Product Page ).

2. The ducting in your home may not be sized, or laid out, to provide correct airflow for the specific IDS model installed. Your installer should verify the static pressure.

3. The room thermostat may be setup incorrectly. Please refer to the instructions for your model of thermostat to ensure that the “Run Cycles” is set to “1”.

4. There may be an incompatibility with the thermostat that you are using. Some brands/models of thermostat interrupt the call for heat (or cooling) when they are charging. If your model of thermostat operates in such a way, then it may cause control issues with your heating and cooling equipment.

5. Your contractor may need to work with our technical support teams to check certain readings (such as the charge level for super heat and sub cooling in force mode). If the product is sized correctly for the application, the ducting and static pressure is proven to be correct, and the thermostat is working correctly, then please have your contractor call our experts on 1 800 283 3787 (Monday – Friday 8am to 5pm) and we will be happy to assist further.