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Troubleshooting
The low pressure is too low -- heating condition
Possible Cause
Handling Method
(1) The refrigerant is insufficient.
Charge the refrigerant.
(2) The air flow entering into the coil is too low or the
air is too cold.
Clean the coil, and inspect whether the fan motor function is
normal.
(3) The unit operates below the minimum operating
environment temperature.
Install an ambient environment disconnecting switch.
(4) The expansion valve is disabled.
Replace the expansion valve.
The high pressure is too high -- heating condition
Possible Cause
Handling Method
(1) The water flow is too low.
Inspect whether the filter screen is blocked and whether the
balance valve is set correctly.
(2) The heating switch is disabled.
a. Inspect whether the heating switch is placed at the correct
temperature sensing position.
b. Replace the heating switch.