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Weil McLain Gold GV Series 3 Not Firing
I have a Weil McLain Gold GV Series 3 boiler with a Weil McLain model 1013-200 controller. When it attempts to fire all the lights turn on in sequence except the flame light. After several start cycles the controller gives up and the power and flame light flash.
At first blush I thought it was either the ignitor or the gas valve that was malfunctioning and this is what I have found so far.
24V present at the valve
Coil resistance - 98 ohms
The solenoid clicks at the appropriate time in the firing sequence
The smell of gas increases dramatically at the outside vent pipe at the time the valve is supposed to open,
Hot Surface Ignitor:
120V present at the hot surface ignitor at the appropriate time
Ignitor resistance - 95 ohms
Ignitor glows red during the sequence when removed from the boiler.
As far as the sequence of events, this is what I have found.
15 seconds after the pressure switch light turns on, 120 V is applied to the ignitor.
20 seconds after voltage is applied to the ignitor, 24V is applied to the gas valve
2 seconds after voltage is applied to the gas valve, the ignitor turns off – 0V
5 seconds after the ignitor is turned off, the gas valve closes – 0V
All indications are that the ignitor and gas valve are working properly but what I cannot determine is if the gas valve is opening fully and I do not have the experience to know if the ignitor is hot enough based on the amount of red color I saw. I also do not have the experience to know if the 2 second overlap when both the ignitor and gas valve are energized is sufficient. It seems rather short to me.