Sanden Heat Pump – Installation Manual
Page 18 of 28
Error Codes
When an error has occurred, a red LED on the operation panel turns on and an error code
is displayed on the LED display. The panel does not turn to the display sleep mode while
the error code is shown.
Figure 14 Error Code example
After a component is replaced or the inspection is completed, turn the breaker on/off
several times to confirm the error does not re-occur.
Below is the list of the error codes. If the corrective action does not solve the error problem,
a malfunction of the PCB valve is highly likely.
Error
code
Error contents
Corrective action
E001
HP water outlet over temperature 1
- Check the heat pump piping filter for
blockage/debris
- Check for any piping bend, blockage or
kinking
- Inspect for frozen pipes
- Ensure mains water supply is available
- Ensure all shut off valves are open
- If the water circulation pump is not
working, replace the pump
E002
HP water outlet over temperature 2
E003
HP outlet temperature thermistor
detection error
- Check if the thermistor is out of the
mounting pocket on the water outlet pipe
E004
HP discharge over temperature 1
- Replace the discharge temp thermistor
- Reconnect the expansion valve PCB
connector, check to ensure connection
- Replace the expansion valve (together
with PCB), or the entire heat pump unit
E005
HP discharge over temperature 2
E006
HP discharge temperature
Thermistor detection error
E007
High pressure side error
- Check the heat pump piping filter for any
blockage
- Check for any piping bend, blocking or kink
- Check if the pipes are frozen
- Ensure mains water supply is available
- Ensure all shut off valves are open
- If the water circulation pump is not
working, replace the pump
E008
High ambient temperature defrost
drive error
- Remove foreign objects from the
evaporator coil (e.g. fallen leaves, grass,
snow)
- Replace the ambient temperature thermistor
- Replace the defrost thermistor
