Rheem / Ruud
-
⛔ Do Not Use
Rheem / Ruud - Error Code 5_flash
Rheem / Ruud Heat Pump error code 5_flash: Flame sensed without call for heat.
Is it safe?
⛔ No — stop using
Do NOT operate — potential gas or CO hazard. Ventilate the area and call a technician immediately.
Can I fix it?
Technician Required
Repair cost
Pro: $150–$600
⏱ 1–3 hours (pro)
What Does Error Code 5_flash Mean?
Rheem / Ruud Heat Pump error code 5_flash: Flame sensed without call for heat.
Part that typically fails: Gas valve / igniter / heat exchanger
Do NOT operate — potential gas or CO hazard. Ventilate the area and call a technician immediately.
Symptoms You May Notice
- ⚠️ Error code displayed
- ⚠️ Heat pump not heating or cooling
- ⚠️ System shutting down unexpectedly
What the Technician Will Do
🔧 Professional repair required. Do not attempt DIY — this repair requires specialized tools or certification.
- 1 Check your owner's manual for model-specific guidance on error code reset procedures
- 2 Check that gas supply valve is fully open and gas supply pressure is adequate
- 3 Clean the flame sensor rod with fine steel wool — carbon buildup is the #1 cause
- 4 If the error persists after reset and basic checks, contact a qualified technician
⚡ Quick tip: Always try a full power reset first — turn the unit off at the breaker, wait 30 seconds, restore power.
Frequently Asked Questions
What does Rheem / Ruud Heat Pump error code 5_flash mean? ▼
Error code 5_flash on a Rheem / Ruud heat pump indicates: Flame sensed without call for heat. The unit has detected this condition and has limited or stopped operation to prevent further damage.
How do I fix Rheem / Ruud Heat Pump error code 5_flash? ▼
Start by powering the unit off for 30 seconds and restarting. If error 5_flash returns, the underlying cause (flame sensed without call for heat) needs to be addressed. Check wiring connections and filters first before replacing components.
Is Rheem / Ruud error code 5_flash serious? ▼
It depends on the root cause. Some 5_flash errors resolve with a reset. Others indicate a failed component that requires professional repair. Don't continue operating with this error — it can lead to further damage.