Rinnai EX22DT Error Codes

Updated October 13, 2026 · by Aurora Star Tech Inc.

Rinnai EX22DT error codes and diagnostic codes (also listed as RHFE-570FTA). The EX22DT is a Rinnai wall furnace in the EX DT series.

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Rinnai EX22DT error codes list

Code	Meaning	Severity
11	No ignition	High
14	Overheat (fusible link)	Critical
16	Room overheat (above 104°F / 40°C)	Medium
30	Overheat temperature thermistor 2 open circuit	Medium
31	Room temperature thermistor open circuit	Medium
32	Room temperature thermistor short circuit	Medium
33	Overheat thermistor 1 open circuit	Medium
34	Overheat thermistor 1 short circuit	Medium
35	Overheat temperature thermistor 2 short circuit	Medium
40	Pressure sensor sensing tube failure	Medium
49	Pressure sensor breakdown	Medium
53	Abnormal spark sensed	Medium
61	Combustion fan fault	Medium
62	Convection fan fault	Medium
70	ON/OFF or Set Back switch fault	Medium
71	Solenoid valve failure	Medium
72	Flame rod failure	Medium
73	Communication error	Medium
99	Flue blocked	Critical

Rinnai EX22DT specs and setup data

Clearances to combustibles and service Rinnai · Wall Furnace · EX DT

All Rinnai Wall Furnace error codes →

Homeowner help: Furnace Not Turning On: What to Check

General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.

Rinnai EX22DT error codes list

Rinnai EX22DT specs and setup data

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