Sime Delayed Ignition

Furnace ignites with a loud boom or pop, sometimes shaking the casing.

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

Dirty burner, Incorrect electrode position, Low primary air, Gas valve opening characteristics out of spec

Safety first: Turn off power and gas. Do not continue to operate the furnace with explosive ignition.

Clean burner: Remove and clean the burner thoroughly, removing rust and debris from ports.
Check ignition electrode: Verify correct gap and position relative to the burner as per Sime specifications.
Flue and air intake: Ensure they are not blocked, allowing proper air supply.
Gas valve and combustion setup (technician): A Sime technician must check gas pressures and adjust or replace the gas valve if necessary.

Professional Required 5/5

Burner Assembly / Gas Valve

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