Troubleshooting guide
Table 15: Troubleshooting for normal malfunction
Malfunction Possible reasons for malfunction Suggested action
Outdoor section does not start
1. Power supply failure.
2. Trip of breaker or open fuse.
3. Supplied voltage is too low.
4. Incorrect setting of the
thermostat.
5. No power to the thermostat.
1. Check the power supply circuit.
2. Measure the insulation
resistance to ground to see if
there is any leakage.
3. Check if there is a defective
contact or leakage current in the
power supply circuit.
4. Check and set the thermostat.
5. Check the thermostat and
thermostat wiring.
Compressor starts or stops frequently
The air inlet and/or outlet has been
blocked or restricted.
Remove the blockage.
Poor cooling/heating
1. The outdoor heat exchanger is
dirty.
2. Air leakage into the conditioned
space or excessive load due to
persons entering and exiting
frequently.
3. Blockage of outdoor heat
exchanger.
4. Incorrect temperature setting.
1. Clean the heat exchanger of the
outdoor unit.
2. Keep certain air tightness
indoors.
3. Remove the blockage.
4. Check and try to set the
temperature again.
Sound from deforming parts
During system starting or stopping, a
sound might be heard. This is due to
thermal deformation of plastic parts.
Note that this is normal and the sound
disappears quickly.
Water leakage
1. The drainage pipe is blocked or
broken.
2. The insulation of the refrigerant
piping is inadequate.
1. Change the drainage pipe.
2. Correct the refrigeration piping
insulation.
Installation Manual: HMH7 Series - 17 SEER Horizontal Discharge Modulating Heat Pump46
Johnson Controls Ducted Systems
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