I've checked the pressure and adjusted it. This heater was turned on by thermostat and kicked of and on several times throughough one day, then i turned it off for the night. Came back the next day and it would fire just for a second, might even fire 2 or 3 times, but will not stay lie after that first day. Any ideas?
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Remove all the burner tubes. Get a soft bristle brush and clean the orifices real good for each burner. Then remove the rust from all the burners with a wire brush and blow them out. That is what I would try first.
The pilot flame must touch (burn) the tip
oqef the t-couple to hold the magnet in the gas value open.make sure the pilot orifice (hole) is clear.the pilot pressure (in the tube) is factory set full open & can only be adjusted down (less). Also check the gas **** didn't get closed or turned half way.? Assuming its not the t-couple. If all is good & it still won't stay on. Replace the gas value.!
Hello my name is Heath it will be my pleasure to assist you. Once the pilot is lit and stays lit you have to turn the gas valve to the on position and the furnace should fire once the thermostat is turned to heat and turned up.
I would check across wires for heat to thermostat with a volt meter . You should read somewhere around 24 volts.set on A.C. scale set to read 50+ volts. If you don't have power ther you probably need to replace transformer.
A few things dictate when the main burner turns on. One is a thermocouple not getting hot enough, the other is a bad thermostat ot thermostat wire, and another is the gas valve. First look at the gas valve located on the heater and make sure it is in the On position and not in the Pilot position. Remove your thermostat and jump the two wires together. The heater should light. If not, go back to the gas valve and find the wires up to the thermostat, the should be attached to terminals marked TH and MV or something similar. Jump the terminals. The heater should start. If not, you may need to replace the thermocouple.
If you have an ML300HGA, it is a manual-control heater, which means you turn it on and you turn it off. No thermostat. It does not have an AUTO setting.
Likewise, the thermostat-controlled models do not have a Manual mode. If you have the ML300TBA, it has a thermostat and will turn itself on/off in order to maintain a room temperature.
On manual models, the numbers (if any) on the dial are heat output selections. Set the control to the highest heat setting and that's what it does until you turn it off.
On automatic thermostat models, the numbers on the dial are temperature selections. Set the control to the highest heat setting and the heater will continue running until it is 85-90 degrees, then shut off. Set it around 2 and it will maintain a temp of around 70 degrees.
All Procom heaters are either automatic (thermostat-controlled) or Manual. None are both.
the control module is the problem it allows the heater to come on then turns off power to the gas valve.if you are not getting enough water flow the high limit is turning the heater off then your problem is flow.