Rinnai · Water Heater error code
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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 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.
Guide · Water HeaterScale insulates the heat exchanger, causing overheat codes and fluctuating temperature. Flush with a pump and descaling solution through the isolation valves.
Guide · Water HeaterRumbling and popping are usually sediment and scale at the bottom of the tank (gas) or on the elements (electric). They rarely mean the tank is failing but they cut efficiency. Banging or squealing can also come from high pressure and thermal expansion, so check pressure before blaming sediment.
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