71 — Gas Solenoid Drive Circuit Fault
The PCB has detected an abnormal condition in the solenoid drive circuit.
- Keep using it?
- Yes, with caution
- DIY difficulty
- Hard
- Verified against
- media.rinnai.us ↗
How to fix it
- Power down and inspect gas valve wiring for damage or shorts to chassis.
- Measure solenoid coil resistance — replace gas valve if out of spec.
- If wiring and valve are good, replace the PCB.
Why it happens
Typical signs: Code 71 on power up or ignition · No burner operation
- PCB drive circuit failure Board can't actuate solenoid correctly.
- Shorted solenoid coil Pulling abnormal current.
- Wiring short Harness shorted to chassis.
More Rinnai tankless water heater codes
Frequently asked questions
What does the 71 code mean on a Rinnai tankless water heater?
The PCB has detected an abnormal condition in the solenoid drive circuit.
What causes the 71 code on a Rinnai tankless water heater?
PCB drive circuit failure: Board can't actuate solenoid correctly. Shorted solenoid coil: Pulling abnormal current. Wiring short: Harness shorted to chassis.
Is it safe to keep using a Rinnai tankless water heater with a 71 error?
Yes, with caution. This is rated a moderate-severity fault.
How do I fix 71 on a Rinnai tankless water heater?
Power down and inspect gas valve wiring for damage or shorts to chassis. Measure solenoid coil resistance — replace gas valve if out of spec. If wiring and valve are good, replace the PCB.
Always unplug an appliance before servicing it. This guide is for informational purposes and is not a substitute for a qualified technician. Verified against manufacturer documentation: media.rinnai.us.