Rinnai RH180 Hybrid Code 71
Solenoid valve circuit fault. The drive circuit to the gas solenoid valves is faulty. Rinnai names them individually on the RH180 — SV0, SV1, SV2 and SV3 — and the remedy is to check the wiring harness to all of the solenoids for damage and loose connections, then measure the resistance of each valve coil.
Call a proThe verdict
Call a licensed plumber
These are the valves that let gas into the burner. There is nothing on this code for a homeowner to check, and the failure mode is a valve circuit that cannot be relied on to open or close when it is told to.
Typical cost: $250–$1,000
US estimate for parts and labor. Prices vary by region and by who does the work — see how we estimate costs.
What the manual says
The meaning above is transcribed from the manufacturer's diagnostic documentation for the RH180 Hybrid — not averaged across the brand.
Source: Rinnai RH180 Operation and Installation Manual (100000319) (p. 36), read Sep 2026 — the manufacturer's own documentation for this exact series.
What you can safely check
Before anything else: if you smell gas, stop here, leave, and call your gas utility.
- Leave the unit switched off.
- Call a licensed professional. Every step Rinnai gives for this code is inside the gas train.
Frequently asked questions
Why does Rinnai list four solenoids here?
The RH180 stages its burner, so it has several gas solenoid valves rather than one. Rinnai names SV0 through SV3 on this appliance and on the Non-SENSEI tankless range, where the newer SENSEI generations describe it as a single gas solenoid valve circuit.
Code 71 on other Rinnai series
The same code number can mean something different on another series — make sure you're reading the page for your exact unit:
Don't confuse this with
One other Rinnai RH180 Hybrid code points at a valve too. They are different components in different places, and ordering a part against the wrong one is the most common way this fault gets expensive: