Rinnai · Water Heater error code
Unlock what this code means, its causes, tests and parts
Full library + AI assistant for $34.90, one time.
Get lifetime accessOnCall Tech is a reference tool for trained technicians and can make mistakes. Always disconnect power and confirm with the manufacturer's documentation before you work.
Guide · Water HeaterOn electric tanks overheating usually means a thermostat welded closed or not clamped tightly against the tank, or a grounded element heating outside thermostat control. On gas tanks it is a gas control fault and must be referred. Treat it as a safety call: overheated water is a scald and tank-pressure hazard.
Guide · Water HeaterStanding-pilot gas tanks use a thermocouple or thermopile heated by the pilot to hold the gas valve open; FVIR models add a thermal switch and flame arrestor. This is a gas appliance: the tech's role here is to read the status light, confirm gas supply, note symptoms and hand off. Pilot assembly, thermocouple/thermopile, burner and gas valve work go to a licensed plumber or gas technician.
Guide · Water HeaterMany tankless complaints are water-side: flow below the activation threshold, a clogged inlet screen, low-flow aerators, or scale in the heat exchanger. Gas supply, venting and combustion codes are blocked: diagnose and refer. Read the code first, then work the water side.
Rinnai · Water Heater
02
No burner operation during freeze protection
Rinnai · Water Heater
10
Air supply or exhaust blockage
Rinnai · Water Heater
11
No ignition
Rinnai · Water Heater
12
Flame failure
Rinnai · Water Heater
14
Thermal fuse open (overheat)
Rinnai · Water Heater
16
Over-temperature warning