Unox WF29

What does Unox WF29 mean?

WF29 is a gas fumes temperature warning on gas ovens. The temperature of the combustion fumes is outside the expected range, which can indicate a combustion, flue or fumes-probe issue. As a warning the oven keeps running with reduced function while flagging the abnormal fumes temperature.

Symptoms

• WF29 warning on a gas oven
• Abnormal fumes/flue temperature
• Possible combustion irregularity
• Warning recurs during gas operation

Common causes

• Combustion running too hot or too cold
• Fumes temperature probe out of range
• Flue or exhaust restriction
• Burner setup or gas pressure issue

Diagnostic steps

1. 01

   Inspect the flue

   Check the fumes/exhaust path for restriction or blockage with the appliance off.

2. 02

   Check the fumes probe

   Verify the gas fumes temperature probe is connected and reading plausibly.

3. 03

   Review combustion

   Have the burner setup and gas pressure checked so combustion is within spec.

4. 04

   Escalate to gas service

   If the fumes temperature stays abnormal, have a qualified gas technician run the gas fumes test.

When to call a professional

WF29 relates to gas combustion fumes. Any work on combustion, the flue or the fumes probe — including the CO/CO2 fumes test — must be done by a technician qualified to service gas appliances. Do not ignore recurring gas fumes warnings.