Wolf DSI Gas Burner Code CFH Light Fast Flash: Safety lockout

What CFH light fast flash means

On Wolf gas burners with a DSI board, such as the GR range, SRT rangetop, and newer DF griddle, charbroiler and French top, a fast flashing CFH light means DSI safety lockout. The board saw flame without a call for heat, a valve feedback mismatch, or a problem in the flame-sense or CFH circuit, and it locked out the burner for safety.

Common causes of CFH light fast flash

Flame sensed when no heat was requested
Gas valve feedback that does not match the command
Flame-sense or CFH circuit problem
DSI board that has locked out

✓ One safe check you can try

1. Turn the thermostat or knob off. 2. Should you smell gas at any time, get out of the house and call the gas utility from outside. 3. Wait a few minutes, then switch the breaker off for one minute and on. 4. Try the burner once. If the light fast flashes again, stop and call us.

! Why to stop there

A lockout around a gas valve is a safety matter, so we do not override it.
The cause may be the valve, the sensor, or the board, and we test each one.
Quote in writing first, with a 30-day workmanship warranty.

Opening a panel yourself does not automatically cancel a manufacturer warranty, but it can cause accidental damage, and some manufacturers set their own service conditions. Check your warranty terms, or ask us, before deciding.

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CFH light fast flashCFH light fast flash questions

What does a fast flashing CFH light mean?

It means the DSI board has gone into safety lockout. The board detected flame at the wrong time, a valve feedback mismatch, or a sensing problem.

Can I reset it?

Turning the control off and cycling power may clear it. If it locks out again, do not keep trying. Call us, because a gas valve or flame-sense issue needs testing.

Is there a gas danger?

If you smell gas, leave the house and call the gas utility from outside. Otherwise the lockout is the safety system working, and we will diagnose and quote first.