Replaced aquastat relay on gas fired boiler and pilot will not stay lit


Old 04-21-05, 04:11 PM
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Replaced aquastat relay on gas fired boiler and pilot will not stay lit

I replaced the 5 year old L8124C aquastat relay after the gas fired boiler would not fire when the tankless water heater was called upon for hot water. After making the repair I could not get the gas pilot to stay lit so I replaced the Honeywell Q313B thermopile. The new thermopile is putting out .823 volts to the gas valve but the pilot will still not stay lit. Question: Should I replace the gas valve next or is there another part of this Burnham 404B boiler that could cause this problem?
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Old 04-23-05, 04:42 AM
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Are you sure this is the right thermopile for the gas vavle? Most gas valves only require a 30 mV thermocouple. Numbers from the gas valve would help. Make sure the pilot is strong & hitting the thermopile.

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