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Heatmaker Boiler Firing Intermittently
DanR132
Member Posts: 2
I have a 1992 Heatmaker H. The boiler is firing intermittently. The house gets cold, check the unit. The blower is running, but not the boiler. Turn off the A/C power, turn it back on. The unit goes through the normal startup and the boiler fires. It runs and cycles OK for a couple days and then back to the mode where the blower is running but the boiler didn't fire. Repeat power cycling and its OK again for a couple days. Its done this 3 time so far. Not sure if it as simple as a bad ignitor (current one is at least 5 years old) or if there is something else wrong that causes it not to fire all the time.
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Comments
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flow switch
more than likely a bad flow switch. It is the object left of the pump with the small copper tubes going into the top and bottom. They are a weak link with this boiler.
The blower and pump are running but until the flow switch closes the ignition wont start. next time the boiler acts up - carefully remove the cover on the front of the flow switch ( it is 24 volts under there ) be careful the idea is to NOT jostle the switch, Then with the cover off you will see a micro switch with I believe a red plunger. with a small tool push the red plunger in and the boiler should fire. This is not a fix it is a way to determine that the switch is the problem. It could also be a pump problem but those Grundfos pumps don't usually work on and off.
DO NOT JUMPER THE FLOW SWITCH - IT MUST BE REPLACED.0 -
No Flow Switch
My unit (H 130) doesn't appear to have a flow switch. I looked up the part # and I don't have anything like that anywhere and the manual doesn't list a flow switch or that part # for my model. Water lines goes through the pump. Nothing else but wiring connected to the pump or inlet.0 -
Heatmaker
It could be a lot of things. A bad stack switch, operating limit, safety limit, clogged coil, cross contamination, control. I would guess a clogged heat exchanger if its never been cleaned in over 20 years. Its not hard to clean, you might need a new ignitor gasket. The blower and flame trap gaskets will probably be ok to reuse. But really, you've gotten your money's worth at 21 years old and I would consider upgrading and I'd recommend the Triangle Tube Excellence.0 -
Pressure differential switch ( pressure switch )
Both the H and the HW have the pressure switch.
Both wiring diagrams show the switch.
What you are describing is a pressure switch problem.0 -
press switch
Pressure switch problem = clogged heat exchanger0 -
Pressure switch
A bad pressure switch does NOT always mean a plugged heat exchanger.
Those switches were a very bad design and just go bad. I have replaced many of them and the heat exchanger was clean inside and outside.0
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