Doing some Heat Siphon heat pump troubleshooting?
These Heat Siphon heat pump error code explanations will help you fix some of the most common Heat Siphon pool heater problems:
Heat Siphon Heat Pump Error Codes
Need help troubleshooting or repairing your pool heater?
Heat Siphon heat pump error code Lo P | Lo A
(My Heat Siphon heat pump says Lo P)
Lo P | Lo A
What it means:
Lo P: the refrigerant system’s low-pressure sensor detects low refrigerant, low air flow, or low air temperature
Lo A: the low-pressure switch was triggered and outside air temperature is under 50 degrees
How to fix it:
- Make sure pool pump is receiving enough water
- Check that pool pump is sending water to the heat pump
- If possible, put the pump speed up a notch
- Check for any clogs or backups causing poor water circulation
- For refrigerant leaks and continuous sensor or fan issues, seek professional pool heat pump repair service
Heat Siphon heat pump error code Hi P
Hi P
What it means: refrigerant system’s high-pressure switch triggered
How to fix it:
- Follow steps for Lo P error
- Consider over-the-phone, DIY pool heater troubleshooting
Heat Siphon heat pump error code Lo / FLO
Lo / FLO
What it means: sensor detecting restricted or low water flow
How to fix it:
- Check for, and clear out any blockage in the baskets (pump, skimmer) and filter system
- Call pool heating to inspect the water pressure sensor
Heat Siphon heat pump error code SH o | SH S
SH o | SH S
What it means:
SH o: water temperature thermistor is open or has damaged wiring
SH S: thermistor has short circuited
How to fix it:
- Have a pool heat pump tech inspect the thermistor
- If shorted, replace the thermistor
Heat Siphon heat pump error code H i / UoLt | L o / UoLt
H i / UoLt | L o / UoLt
What it means:
H i / UoLt: high voltage being received from transformer (more than 31.2 VAC)
L o / UoLt: low voltage being received from transformer (less than 19.2 VAC)
How to fix it:
- Visually inspect the heater’s electrical connection for any damage or corrosion
- Seek professional assistance for correcting the wiring issue
Heat Siphon heat pump error code HS S | HS o
HS S | HS o
What it means:
HS S: main contactor coil has shorted
HS o: open contactor coil, or no resistance detected
How to fix it:
- Have unit inspected for wire or coil damage. Replace as necessary
Heat Siphon heat pump error code CAnt / HEAt
CAnt \ HEAt
What it means: pump has been running for over 24 hours with no temperature gain. Possible causes include an undersized heater, heat loss, or cold air temperature.
How to fix it:
- Use a solar cover to alleviate heat loss
- Problem should resolve once possible causes have been addressed
Heat Siphon heat pump error code SA o | SA S
SA o | SA S
What it means: low-pressure sensor in refrigerant system may be open
How to fix it:
- Replace thermistor
- If problem persists, replace board
Heat Siphon heat pump error code no / Pod
no / Pod
What it means: pump is searching for external pod controller and cannot find it
How to fix it:
- Power off the heat pump to clear the error code
Heat Siphon heat pump error code Air / Hi
Air / Hi
What it means: old error code for detecting board temperature
How to fix it:
- Seek manufacturer for board software update
Heat Siphon heat pump error code CH o | CH S
CH o | CH S
What it means:
CH o: reversing valve coil has an open circuit
CH S: reversing valve coil has short circuited
How to fix it:
- Inspect wiring for damage
- If shorted, replace reversing valve coil
The following error codes are for circuit board issues and should be fixed by a professional
Heat Siphon heat pump error code Brd1
What it means: Heat Siphon board has shorted
Heat Siphon heat pump error code Brd2
What it means: reversing valve board short
Heat Siphon heat pump error code Brd3
What it means: POD board short
Heat Siphon heat pump error code Brd4
What it means: loose wires in control panel
Heat Siphon heat pump error code Brd5
What it means: loose connection or screw on reversing valve
