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My boiler most of the time don't star until I push the switch in the pressuretrol (honeywell) PA404A1033. After I activate the turn on and off regular for some hours but later again don't star until I pushed the pressure switch. Please let me know what can I do.

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Looks as if your boiler is over firing (extended run) you probably have a faulty sensing thermostatic probe causing this the switch you are resetting is a safty pressure switch it is designed to keep the pressure from building which could cause the boiler to explode.

Posted on Nov 15, 2008

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I have installed honeywell aquastat relay per instruction manual on my dunkirk xeb-4 lp boiler furance with honeywwell ignition unit s8610u but it wont ever start the exhaust fan checked everything several...


If aquastat wirings are ok, and control module had been set up properly, the the furnace should start.
Check if bypassing the control the furnace starts, if it starts then check aquastat wirings.
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I have a Powermax 155 boiler that keeps losing pressure. Most of the time, I can usually work around this by closing the tap in the boiler until the pressure rises, but it's not working this time. I...


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1 Answer

Hhow to set the pressuretrol??


Hi,
I assume you are talking about a steam heating system...
There are two screws on the top of the pressuretrol...


turn the pressure screw down to the lowest pressure at which you still get heat to the farthermost radiator...make sure the vents are working...or steam does not flow to displace the air...
Then just give the differential screw enough difference so the boiler cycles on and of a bout three times and hour...when making steam...
That's all there is too it...

heatman101

Oct 08, 2010 | Air Conditioners

1 Answer

What would the correct high and lo and diff settings for the Honeywell L8124A Aquastat I have a wood fired boiler with the oil fired boiler side by sides,


I would say high if you need cooling. If the tempature is cool enough for you then set it to low.If you are hot and need more cooling then high.

Apr 05, 2009 | Honeywell Air Conditioners

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This may be caused by accumulation of sludge in the steam trap (the looped tube that connects the pressuretrol unit to the boiler). the sludge restricts the pressure from reaching the diaphragm in the pressuretrol unit. So it gets a false reading. Clean or replace the tube and see if normal function resumes.

Jan 06, 2009 | Air Conditioners

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