Hello, I have an old c-405b-en pool heater that is acting up. the pilot lights, the burns ignite and then a short while later the burners go out ant the heater starts making a continuous clicking sound like the burner is trying to light. while this is happening the pilot is lit. Any help you can give would be great.
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there are a few things you can check. make sure you have a good fuel supply. make sure the pilot light is lit. (just because the pilot is on doesnt mean you have good fuel supply). the pilot may be out of adjustment from the burner rail. the igniting burner rail may be dirty or blocked
Don't really think the gas company would be checking your pool heater, they most likely just checked their gas connections. I would suspect a few things; control module, thermostat, gas valve, pressure switch. You say you get pilot light, and as long as it doesn't turn off and on, as if it is not being sensed, then I would suggest the control module is fine. If the pilot and main burner is controlled by the same valve, and your pilot light stays lit, then I would suggest the thermostat is fine. I take back the pressure switch since the pilot will ignite. I would check power to the gas valve solenoid and see if the control module is trying to open the gas valve. I would suspect low voltage, probably around 24v. If voltage is present and no gas, I would say you found the problem.
There is a flame sensor on the assy and the wire is dual purpose, sending the voltage to ignite fuel, and then sensing the burning flame and sending that reading to system, confirming that its ok to open main fuel supply and ignite main burners.
This is an old, but good heater. Power is either stopping thru the safety loop, high limits or pressure switch, or the pilot generator is tiring out and not sending enough power to keep the gas valve open.
This is probally your ignition wire is bad and not reading flame at the pilot or your pilot is bent or something so that when the pilot lights the flame isn't hitting the sensor probe at the pilot. When looking under the heater use a mirror so if you get roll out of the flame you don't get burned. Good luck and be careful.
to thermocouple where the pilot light sits is either dirty/carbon out of alignment flame not burning on it correctly or damaged/broken which would mean replacement
The thermal bulb is mis alinged or is defective and can be bought at any hardware store cost's about $45.00 an takes 1/2 hour to change out. you may want to make sure the thermal bublb is directly in the path of the flame as this will cause it not to eok as well.
sounds like when burner kicks in it is diverting gas away from pilot. you have either too low pilot heighth or more likely an obstruction in pilot assembly
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