Rheem Error F004: No flame detected during ignition trials
The boiler attempted to light but no flame was sensed after four ignition trials, so the control locks out to prevent raw gas from accumulating. The unit will show no heat or hot water until reset. We diagnose and repair it across Greater Vancouver — same-day and after-hours.
The boiler attempted to light but no flame was sensed after four ignition trials, so the control locks out to prevent raw gas from accumulating. The unit will show no heat or hot water until reset.
Rheem fault codes can vary by model and series. Use this as a guide — the same code can have more than one cause. Our Technical Safety BC–licensed technicians read the code, confirm it against your unit's manual, and diagnose the true cause before any repair.
Likely causes of Rheem error F004
- External gas shutoff valve closed or low gas supply / inlet pressure (below ~4 in. w.c. during ignition)
- Failed or fouled hot surface igniter / ignition electrode
- Poor unit grounding or loose ignition-module wiring
- Faulty gas valve not opening on demand
- Ignition control module fault
What you can safely check
- Confirm other gas appliances in the home still light (gas supply is on)
- Make sure the boiler's gas shutoff valve has not been turned off
Beyond these checks, do not open the unit or touch gas/electrical parts — BC law requires a licensed gas fitter. Call us for a proper diagnosis.
Error F004 usually leaves you without heat or hot water and can indicate a safety-related fault. Don't keep resetting it — call for priority after-hours Rheem repair.
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Parts often behind Rheem error F004
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Rheem Error F004 Repair Across Metro Vancouver
Related Rheem Ignition & Flame Codes
Frequently Asked Questions
Fix Rheem Error F004 Today
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