Worcester 240 delay in firing up main burner?

Hi,

How it works is that the electrode for the spark first ignites the pilot, then if the pilot flame is the correct size it makes contact with the electrode and the flame sensing circuit on the circuit board conducts through the flame which then allows the main burner to operate. If the pilot is not correct or if the ignition lead or pcb is faulty this will prevent the main burner operating.

Ian
September 2008

The igniter does spark after the pilot is on and as soon as the relay operates on the sequence board the main burner comes on. How does the igniter sence the flame? I was looking for a sensor but cant find one. Is there a sensor in the spark ignitor itself such as heating the ignitor changes the resistance. If you could elaborate one the opperation of the ignition unit I would appreciate it.

Booji

Booji

Booji
September 2008

possibly a poor pilot light, if the igniter keeps sparking after the pilot is lit the electrode is not detecting the pilot flame and will not energise the main gas solenoid. May just require the dust blowing out of the pilot assembly or the pilot jet cleaning.

Ian
September 2008