Rheem
Inefficient Combustion or Control Settings
Boiler runs but gas consumption seems unusually high
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Incorrect gas valve adjustment, Dirty burner or heat exchanger, Faulty outdoor reset or thermostat settings, Constant domestic hot water preheat
How to Fix / Troubleshooting
Safety first: Gas valve adjustments and combustion analysis must be performed by qualified technicians.
- Step 1 – Check control settings: Review space heating setpoints, schedules, and DHW preheat options on the Rheem control. Disable unnecessary preheat or comfort modes.
- Step 2 – Thermostat programming: Ensure thermostats are programmed with appropriate setbacks and not calling for heat continuously.
- Step 3 – Maintenance: Schedule annual maintenance including burner cleaning, heat exchanger inspection, and condensate system cleaning to maintain efficiency.
- Step 4 – Combustion check: A technician should perform a combustion analysis and adjust the gas valve and fan speeds per Rheem specifications.
Warning: Do not attempt to adjust gas valve screws or combustion parameters without proper instruments.
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Repair Difficulty
Medium
3/5
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