Rheem Heat Pump Water Heater Problems
On this page (6 sections)
The Short Answer: Most Rheem hybrid problems show up as an alert on the display and the heater switching to its electric elements. The usual causes are restricted airflow from a dirty air filter or tight space, a blocked condensate drain, a space that is too cold for the heat pump, or a compressor or sensor fault. Note the alert code, check the filter and drain, and call for service if it comes back.
How a Rheem hybrid behaves when something is wrong
A Rheem hybrid has a heat pump on top that pulls heat from the surrounding air, plus electric elements for backup. When the control detects a heat pump problem, it usually falls back to the elements, so you may still have hot water while the efficiency you paid for is gone and the electric bill climbs. An alert on the display or in the EcoNet app tells you which part has the problem.
Alerts from the Rheem manual
The table below summarizes alerts listed in Rheem’s hybrid Use & Care manual (AP23657) (opens in a new tab). Older Rheem, Ruud, and Richmond hybrids may use different codes, so check the manual for your model.
| Alert | What Rheem says it means | What you might check |
|---|---|---|
| T131 | Clean filter reminder | Wash the air filter as the manual describes |
| A004 | Compressor shut down on a discharge or suction trip; heater runs on elements | Fan running and filter clean, then service |
| A005 / T005 | Discharge temperature high due to low airflow; runs on elements | Filter, clearances around the unit |
| A006 / T006 | Suction temperature too low | Space temperature and airflow, then service |
| A008 | Dry fire: tank not full | Make sure the tank is full; call for service if it persists |
| A105 | Evaporator temperature sensor failure; runs on elements | Service |
| A107 | Water detected in the drain pan | Look for a leak |
| A108 | Condensate blocked; runs on elements | See Rheem A108 condensate blocked |
| A130 | Freezing ambient temperature | Space is too cold for the heat pump |
Common problems and what to check
Slow heating or the elements running all the time. A clogged air filter is the most common cause. Rheem’s manual covers removing and washing it with mild detergent. Also make sure the heater has the open space around it that the installation instructions require; a heat pump in a small closet without enough air can overheat or run inefficiently.
Water around the heater. A heat pump produces condensate, which drains through a tube to a floor drain or pump. If the tube is kinked, clogged, or frozen, or the condensate pump fails, water can back up and trigger A108 or A107. Cool water near the drain tube is usually condensate; hot water from the tank or drain valve is a different leak. See Rheem water heater plastic drain valve leaking.
Cold garage or basement. The heat pump can’t work efficiently in a very cold space and will rely on the elements. That is expected behavior, not a fault, though A130 means it is too cold for the heat pump to run.
Operating mode. Check that the heater isn’t set to Vacation mode, or to an electric-only mode left on after a past problem.
No display. Check the breaker. If it trips again after one reset, leave it off.
What the technician will check
A technician trained on heat pump water heaters will read the alert history, check fan operation and airflow, test the temperature sensors, and check compressor operation and the refrigerant system for leaks. They also check the condensate sensor and drain, the elements and thermostats used for backup heat, and the tank itself. Refrigerant work requires certification.
Repair or replace
Filters, condensate drains, sensors, fans, and elements are repairable. Compressor and sealed-system repairs are bigger jobs, and warranty coverage matters, so have your serial number ready. A leaking tank means replacing the heater, whatever condition the heat pump is in.
Related: hybrid water heater noise and heat pump water heater location.
Frequently Asked Questions
Q: Why is my Rheem hybrid only heating with the elements? A: It switches to the elements when it detects a heat pump problem (airflow, condensate, sensors, or the compressor) or when the space is too cold. Check the display for an alert and clean the filter first.
Q: How often should I clean the filter? A: Follow the clean-filter reminder on the display and the interval in your manual. Heaters in dusty garages or laundry areas usually need it more often.
Q: Is it OK to run it in electric-only mode while waiting for repair? A: As a short-term measure, if the tank is full and not leaking, yes. It will cost more to run, and the original fault still needs fixing.
Manuals and supporting references
These links distinguish general safety information from model-specific documentation. A manual directory helps you locate your unit’s instructions; it does not establish that every model uses the same parts, codes, or test values.
- Rheem: Electric Residential Hybrid Water Heater Use & Care Manual (AP23657) (opens in a new tab)Current-generation Rheem hybrid (heat pump) water heaters covered by manual AP23657; older generations use different alert tables.
- Rheem: owner help and support (opens in a new tab)Identify the applicable model instructions or contact Rheem support.
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