Brivis and Rinnai Ducted Heating Error Codes Explained

Brivis is part of the Rinnai group and Rinnai directs its ducted gas heater code support to the Brivis list, so the two brands share the same codes. The meanings below are the plain-English summaries we published on our original guide, drawn from manufacturer documentation. Flame failure, overheat lockouts and pressure switch faults are the codes we see most through a Ranges winter, and most are repaired on the first visit because we are factory-trained dealers for Brivis and Rinnai and carry the common parts.

If your controller is showing a code, switch the heater off and book a licensed technician. Gas faults should never be left running.

Brivis and Rinnai error codes

Code	What it usually means
Error 30	Fan limp mode or fan speed sensing fault
Error 31	Flame rollout during ignition
Error 32	Data error or stored parameter data fault
Error 33	Modulating gas valve open circuit
Error 35	Supply air thermistor open or short circuit
Error 36	Bad supply air thermistor location or thermistor issue
Error 37	Fan speed sensor or tacho error
Error 40	Return air overheat or overheat condition
Error 41	Supply air overheat
Error 42	Supply air thermistor overheat
Error 43	Overheat cooldown mode
Error 44	Flame rollout detected
Error 45	Low 24V AC supply
Error 46	No flame on ignition or failed to light
Error 47	Unstable flame or failed flame validation
Error 48	Pressure lost during heating cycle
Error 49	Flame lost during heating cycle
Error 50	Ignition lockout after multiple ignition attempts
Error 51	Rollout or flame signal detected when no gas should be present
Error 52	False flame signal with gas valve off
Error 53	Overheat lockout from multiple overheat events
Error 54	Rollout lockout
Error 55	Flame validation lockout or ignition failure
Error 56	Pressure switch lockout, flue restriction or condensate blockage on SP6 models
Error 57	Pressure switch stuck closed
Error 58	Pressure switch fail or excessive pressure loss
Error 59	Cross-check communication error between control processors
Error 60	Motor open circuit
Error 61	Primary gas valve stuck off
Error 62	Primary gas valve stuck on
Error 63	Primary gas valve failure
Error 64	Modulating gas valve overcurrent
Error 65	Motor lockout
Error 66	Secondary gas valve stuck off
Error 67	Secondary gas valve stuck on
Error 68	Secondary gas valve failure
Error 69	24V fuse blown or 24V supply lost
Error 70	Remote microcontroller shutdown fail
Error 71	Remote microcontroller state mismatch
Error 72	Ambiguous control fault
Error 73	Remote microcontroller sequence error
Error 74	Remote microcontroller lockout
Error 75	24V AC input scan fault
Error 76	Lockout storage fault
Error 77	Remote microcontroller I/O mismatch
Error 78	Remote microcontroller I/O mismatch
Error 79	A/D converter error
Error 80	Flame sense fault
Error 81	Rollout sense fault
Error 82	System timing fault
Error 83	Internal MCU execution fault
Error 84	Control board lockout
Error 85	Control board lockout
Error 86	Control board lockout
Error 87	Cross-check communications fault or no communication with remote MCU
Error 88	Control board lockout
Error 89	Non-volatile lockout storage test code, should not normally appear

Older Brivis Buffalo and Wombat flash codes

Older Brivis Buffalo and Wombat heaters show faults as a number of flashes on the controller rather than a code number.

Code	What it usually means
1 flash	Overheat condition
2 flashes	Multiple overheats or overheat lockout
3 flashes	Flame rollout
4 flashes	Multiple rollouts or rollout lockout
5 flashes	Safe start lockout
6 flashes	Ignition invalid or ignition lockout
7 flashes	Gas valve failure or lockout
8 flashes	Frequency fault or lockout

Before you do anything else

A fault code is the heater protecting itself. Most codes mean the control board has detected something outside its limits and shut the burner down. The safe things a homeowner can do are limited, and they are the same for every brand:

1. Turn the heater off at the controller and leave it off for a minute or two, then turn it back on once. If the code returns, stop; repeated resetting can mask a fault the heater is trying to warn you about.
2. Check the switchboard for a tripped circuit and check that the heater’s isolator has not been switched off.
3. Check the return air filter. A badly blocked filter causes overheat and airflow faults on every brand. Clean or replace it if it is dirty.
4. Do not open the heater, touch gas fittings, wiring or the flue, or attempt any repair yourself. Gas heater faults need a licensed technician.
5. If you smell gas, turn the heater off, turn off the gas at the meter if you can, open windows, do not operate electrical switches near the smell, and call your gas distributor’s emergency line before anyone else.

When to stop and book a repair

Any code that comes back after one reset. Any flame, ignition, gas valve, overheat, rollout or flue-related code, first time. Any code accompanied by a smell, soot marks around the unit, headaches while the heater runs, or a heater that keeps cutting out. Tell us the brand, the code and what the unit is doing when you book a repair and the technician arrives with the likely parts.

Other brands

Braemar error codes, Bonaire error codes, or the error code hub. For the systems themselves, see our Brivis and Rinnai pages and gas ducted heating service.