f7
Moderate
Rheem · HVAC Systems & Water Heaters
Gas Valve Failure (Tankless Water Heater)
Quick Answer
Error code F7 on your Rheem HVAC Systems & Water Heaters means: Gas Valve Failure (Tankless Water Heater). This is usually fixable — see the step-by-step guide below.
Likely Causes
How to Fix It
1
Verify gas supply is on and adequate pressure is available
2
Measure resistance across the gas valve solenoid coils (compare to manufacturer specifications)
3
Check wiring from the control board to the gas valve for continuity and damage
4
Verify the control board is sending the proper signal to the gas valve during a call for hot water
5
Gas valve replacement on a tankless unit involves gas piping and must be done by a licensed plumbing or HVAC technician
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Gas valve assembly
Control board
Wiring harness
Related Error Codes