Rinnai Error Code 99: Flue blocked (Wall Furnace)
Rinnai error code 99 on a wall furnace means: Flue blocked. It is also called Rinnai diagnostic code 99.
Homeowner? What Rinnai code 99 means for you
Stop and call Your wall furnace is reporting: Flue blocked. This code is a safety shutdown. Turn the wall furnace off and call a licensed technician. Do not keep resetting it. If you smell gas, leave the house and call your gas utility or 911 from outside.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Rinnai error code 99 mean?
The flue is blocked, so exhaust gases cannot be expelled safely.
Applies to: Rinnai EnergySaver direct vent wall furnaces EX08DT, EX11DT, EX17DT, EX22DT
Common causes of Rinnai code 99
- Obstruction at or in the flue terminal (snow, ice, debris, nests)
Rinnai models that use code 99
EX08DTEX11DTEX17DTEX22DTEX22DT-W
Other Rinnai Wall Furnace codes
| Code | Meaning |
|---|---|
| 61 | Combustion fan fault |
| 62 | Convection fan fault |
| 70 | ON/OFF or Set Back switch fault |
| 71 | Solenoid valve failure |
| 72 | Flame rod failure |
| 73 | Communication error |
All Rinnai Wall Furnace error codes →
Rinnai code 99: homeowner questions
What does Rinnai code 99 mean?
Flue blocked. The flue is blocked, so exhaust gases cannot be expelled safely.
Is it safe to keep using my wall furnace with code 99?
No. Code 99 is a safety shutdown, so keep the wall furnace off until a licensed technician has checked it.
Can I reset Rinnai code 99 myself?
Do not keep resetting it. Repeated resets can hide a safety problem; a licensed technician needs to find the cause.
Who can fix Rinnai code 99 near me?
Aurora Star Tech Inc. repairs Rinnai wall furnaces in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Furnace Not Turning On: What to Check
Source: Rinnai EX08DT/EX11DT and EX17DT/EX22DT Installation and Operation Manuals (200000083, 200000084), Table 9 'Diagnostic Codes', p.35–36. Written in our own words as a summary; always check the original manual.
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.