Rheem Troubleshooting Guide | Poolheatpumps.com (2024)

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XI. Troubleshooting

If your heat pump does not operate, or simply does not heat your pool water, the indicator lamps on the front control panel (see Section IV) can provide valuable clues as to what is wrong, and may even indicate precisely what the problem is. Always observe these lamps before calling a service representative. By reporting on the telephone which lamps are ON and OFF, the service rep may be able to solve the problem without the expense of a service call.


-Is water flow through the unit adequate? Check the unit for obstructions, such as a clogged filter pump strainer, a dirty filter, or valves not positioned correctly.

-Is the ejected air from the unit 8-10 cooler than incoming air? If so, the unit is extracting heat from the aIs water condensing on the evaporator and internal copper pipes? This is also evidence of heat removal from the air. When the air is cool with low humidity, condensation may not be evident.

-How long has the unit been operating? During initial pool heating in cold weather, it may require a week to elevate the water temperature to a comfortable level. Normally, it takes about 4 days.

-How many hours per day is the unit operating? Remember that the heat pump only operates while the pool pump is running. Set the time clock to permit 24 hour per day operation. After the desired temperature is reached, return the unit to normal operation of 8-10 hours per day.

NOTE: If the pool pump and heat pump shut OFF before the water temperature is raised to the desired level, you must lengthen the running time of both. To do this, reset the time clock dial for the longer running time, or manually operate the pump with the timer override switch. Since the heat pump capacity and efficiency are both greater at higher ambient air temperatures, run time should be set to take advantage of all daylight hours, when the air is generally warmer.

-Is airflow through the unit being obstructed? Restrictions such as shrubbery, tall grass, dirty

coils, or any other obstruction to airflow will reduce performance.

-Is the pool blanket/cover being used? Unblanketed pools can lose up to 10 degrees per night compared to 4 degrees or fewer when a blanket is used. Without a blanket, the total heat gained during the day can be lost overnight.

-Are rapid heat losses occurring in some other way, such as high wind, spillage, rainfall, flow through solar panels at nights, or a high water table?


-Is the control panel Power lamp ON? If not, the circuit breaker may be shut OFF or tripped. Reset the breaker by switching it OFF, then back ON. Verify that the breaker is set and operating properly before calling for service.

-Are the thermostat setting and the Pool/Spa setting correct? Verify that the temperature has been properly set on the thermostat, and that it is higher than the current water temperature. At this time all three lamps should illuminate and the fan should start to run.

-Is the Water Flow lamp ON? This lamp will turn OFF if not enough water is flowing through the unit. Improperly positioned valves or a dirty filter could decrease the flow of water required for efficient operation. If this lamp is OFF, but you can feel normal flow at the pool returns, check the water valves or settings.

-Have you waited approximately 5 minutes for the time delay? After the unit has been running and then shut OFF for any reason, there is a delay before operation can begin again.

-Is the Heat Demand lamp ON? If not, then the thermostat setting is not higher than the temperature of the water. Raise the thermostat setting.

NOTE: The heat pump will not run when the Remote position is selected on the Pool/Spa selector switch and there is no remote control system attached.ir and transferring it to the pool.


Heat pumps can produce a large amount of condensation (water) during operation. If you suspect that the heat pump is leaking:

a. Use a pool chemistry test kit to confirm there is no chlorine in the condensation. Or,

b. Shut the heat pump OFF and leave the filter pump running to see if the water stops dripping. If the water stops dripping, the heat pump is not leaking.

Rheem Troubleshooting Guide | Poolheatpumps.com (2024)
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