Rinnai gas heater code 32: Room temperature sensor fault

Gas heater, Australia

The room temperature sensor is faulty.

This needs a licensed gasfitter. There are a few safe checks you can do first, marked below. Anything inside the unit is a job for a professional.

What causes it

A faulty room temperature sensor. A service call is required.
Turn the Energysaver heater off and on againYou can do this
1. Turn the heater OFF using its On/Off button, then turn it ON again.
2. If the error returns on the next operation, contact Rinnai or a service dealer for a service call.
Book a licensed gasfitter

Turn the unit off and leave the covers on. Gas components must only be serviced by a licensed technician.
Note the code, how often it appears, and the model and serial numbers from the rating label.
Book a licensed gasfitter and give them those details.

6 models in 2 ranges

Range	Models
Energysaver FDT commercial flued gas heater	RHFE-559FTSN (Energysaver 559FDT), RHFE-1005FTSN (Energysaver 1005FDT)
Energysaver FT flued gas heater	RHFE-309FT3 (Energysaver 309FT), RHFE-559FT3 (Energysaver 559FT), RHFE-561FT3 (Energysaver 561FT), RHFE-1005FT3 (Energysaver 1005FT)

Checked against the manufacturer's manual on 9 October 2026.

Code	Meaning	What you can do
11	Ignition failure	Safe checks first, then a pro
12	Flame failure	Safe checks first, then a pro
14	Filter blocked or overheat	You can often fix it
16	Room overheat	You can often fix it
30	Overheat temperature sensor fault	Safe checks first, then a pro
31	Room temperature sensor fault	Safe checks first, then a pro
33	Overheat temperature sensor fault	Safe checks first, then a pro
34	Overheat temperature sensor fault	Safe checks first, then a pro
35	Overheat temperature sensor fault	Safe checks first, then a pro
40	Sensor tube failure	Call a pro
49	Sensor breakdown	Safe checks first, then a pro
53	Spark sensor fault	Call a pro