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Page 5
SECTION 5 - TROUBLESHOOTING
While troubleshooting in cooling mode indicators may fluctuate. Always troubleshoot in heating mode.
ERROR CODES
SYMPTOM
"FLO"
Insufficient water flow
through heater or
circulation pump is off
"CEr" Error
Communication Fault
"CSE" Error
Control System Error
"dPC" Error
Defrost Sensor Shorted
"dPO" Error
Defrost Sensor Open
"FS" Error
Unit in defrost mode.
"HP" Error
High Pressure.
"HP5" Error
Equipment has
registered high pressure
five times and locked.
"LP" Error
Refrigerant Issue
"LP5" Error
Refrigerant Issue
"OTA"
Over Temperature
Alarm
Temperature over
110° F (Unit Locked)
"PC" Error
Water Temperature
Sensor Shorted
"PO" Error
Water Temperature
Sensor Open
RULE OUT
Insufficient Water Flow
Filtration Dirty
Possible Water
Pressure Switch
N/A
N/A
N/A
N/A
Normal defrost mode
Insufficient Water Flow
Filtration Dirty
Possible Refrigerant
Issue
Insufficient Water Flow
and/or Filtration Dirty
N/A
N/A
Other heating
equipment
N/A
N/A
Step 1:
Confirm water pump is on and water valves are in the correct position to allow
water to flow through Heat Pump. If error persists, proceed to next step.
Step 2:
Confirm filtration system is clean. Backwash if needed. If error persists,
proceed to next step.
Step 3:
Request Service
Request Service
Request Service
Request Service
Request Service
Step 1:
If error persists after air temperature is over 50° F, request service.
Step 1:
Confirm water pump is on and water valves are in the correct position to allow
water to flow through Heat Pump. If error persists, proceed to next step.
Step 2:
Confirm filtration system is clean. Backwash if needed. If error persists,
proceed to next step.
Step 3:
Request Service
Step 1:
Follow steps outlined in "HP" error, then reset circuit breaker to clear error. If
error persists, request service.
Request Service
Request Service
Check if alternate heater (such as a solar heater) is heating water leading to
heat pump. If "yes", turn off alternate heater and check if error clears. If error
persists, request service.
Request Service
Request Service
RESOLUTION
Table 8
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