Boiler Sparks But Will Not Light

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Boiler sparks but will not light. Boilers are a fickle mistress at times. Boiler ignition circuits have been known to be elusive in its diagnosis.

Boiler sparks but will not light is a common boiler problems on steam boilers.  A simple problem is a stuck low water cut off control.  Tigger handle a few times and it may clear the gunk out of the float switch allowing for the float to free itself for proper operation of ignition circuit.

There are 2 types of ignition circuits on steam boilers. 1 is the infamous standing pilot and 2 is the Boiler spark ignition type.  Spark ignition gives that tic tic sound when sparking for ignition.

Basically the same sound your home stove makes when turning on the gas. Then your standing pilot gives the distinctive swoosh sound when igniting.

However on a standing pilot boiler if the pilot goes out from wind or a defective thermocouple then no heat will be present. Defective Baso valves can also play a role in no heat scenario on a standing boiler piloted system.

Back to spark ignition circuits, a boiler that sparks and will not light can be contributed to a defective spark control board.  Don’t be fooled.  Let me explain, in order for a spark ignition circuit to operate properly a solid ground needs to be sensed.

On the pilot assembly there is a ground that rectifies back to the spark control board.  Make sure connections are tight.  Also if a wire is attached to burner where pilot assemble is attached remove wire and sand the spot where ground wire attaches and reconnect.  Many times that quick fix will return your heat to normal.

The gas valve especially honeywell gas valves have a ground terminal spade connector on its valve body. Sometimes a ground added to the gas valve to the spark board ground burner also will return your heat to normal.

Thanks for reading.


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    Only $129.00.

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