Rinnai Tankless Water Heater Error Code 52: How to Fix It

Q: Will error 52 clear itself?

No, error 52 indicates a hardware fault. It will not clear until the short circuit is resolved. Resetting the unit may temporarily clear it, but the error will return if the root cause is not fixed.

Q: Can I bypass the solenoid valve to get hot water?

No. Bypassing the solenoid valve is dangerous and can cause a gas leak or fire. The solenoid is a critical safety component that controls gas flow. Always replace a faulty valve.

Q: How much does it cost to fix error 52?

If you DIY, a replacement gas solenoid valve typically costs $50-$150. A control board replacement can be $200-$500. Hiring a technician adds service call and labor fees, typically $150-$300 total.

Q: Is error 52 common on Rinnai tankless heaters?

It's less common than other errors but can occur due to power surges, water damage, or normal wear on the solenoid. Regular maintenance can help prevent it.

Q: What other codes are related to 52?

Error codes 51, 53, and 54 also relate to gas valve or solenoid issues. Error 52 specifically points to a short circuit, while others indicate open circuits or communication faults.

Abstract

Error code 52 on a Rinnai tankless water heater indicates a short circuit in the gas solenoid valve circuit. This safety feature prevents the heater from operating, and requires checking wiring, connections, and the solenoid valve itself. Before attempting any repairs, ensure the unit is powered off and gas supply is shut off.