De Dietrich Gas Leak or Incomplete Ignition

Furnace produces a strong smell of gas near the unit, especially at startup or shutdown

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Leaking gas union on De Dietrich gas train, Faulty gas valve not closing fully, Delayed ignition due to weak spark, Incorrect ignition electrode gap

Emergency safety: If you smell gas strongly:

Do not operate electrical switches or create sparks.
Open windows and doors to ventilate.
Close the gas shut‑off valve to the boiler if accessible.
Evacuate the area and contact the gas emergency service and a qualified technician immediately.

Do not attempt repairs: Gas leaks and ignition problems must only be handled by licensed gas professionals.

Professional Required 5/5

Gas Valve Assembly

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