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Old 11-19-2008, 08:48 PM   #1
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Aquastat transformer blowing

I have an old boiler and one day it would not start. I checked w/ volt meter and found tranformer was dead. I replaced it and it blew imediately. I can start the boiler manually by jumping the relay. Any idea what the problem is. Is it the gas valve?

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Old 11-19-2008, 09:02 PM   #2
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Aquastat transformer blowing

doubtful its the gas valve if its low voltage and working by jumping the relay how are you jumping relay just pushing contacts in? can you take pics?
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Old 11-19-2008, 09:07 PM   #3
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Aquastat transformer blowing

The aquastat has a relay in it that I activate by wedging a plastic paint scraper in (don't laugh). This activates the circulator. Then there is a switch on the gas valve that says auto or manual. I switch it to manual and the boiler fires up. If pictures help I will be more then happy to post. But unfortunately I'm not home at the moment.
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Old 11-19-2008, 09:13 PM   #4
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Aquastat transformer blowing

the gas valve must be ancient if you can open it without electricity as a guess id say something within the aquastat is shorted but pics would prolly help
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Old 11-19-2008, 09:21 PM   #5
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Aquastat transformer blowing

Yes..I heard it was ancient. But when I first found the transformer to be dead I replaced the entire aquastat. As soon as I turned up the thermostat to test it, it blew again.
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Old 11-19-2008, 09:43 PM   #6
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Aquastat transformer blowing

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Yes..I heard it was ancient. But when I first found the transformer to be dead I replaced the entire aquastat. As soon as I turned up the thermostat to test it, it blew again.
try reading for continuity between the terminals and the metal case of the valve one terminal at a time with wires off read them the same way(wires to ground). but really if the valves that old its more than likely the prob are you sure the aquastat turns the valve on and not just run the pump id think something that old would use a pilot generator(thermopile)
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Old 11-19-2008, 10:37 PM   #7
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Aquastat transformer blowing

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Originally Posted by scottsbws View Post
I have an old boiler and one day it would not start. I checked w/ volt meter and found tranformer was dead. I replaced it and it blew imediately. I can start the boiler manually by jumping the relay. Any idea what the problem is. Is it the gas valve?
It takes quite a bit of power to immediately blow a xformer. Coils are usually hardy.
Input voltage way above 120v?
Less likely is a downstream short.
What volts, amps for this xformer?
Can you post a schematic?
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Old 11-19-2008, 10:46 PM   #8
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Aquastat transformer blowing

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It takes quite a bit of power to immediately blow a xformer. Coils are usually hardy.
Input voltage way above 120v?
Less likely is a downstream short.
What volts, amps for this xformer?
Can you post a schematic?
yoy: its the little one i belive that is part of the aquastat as he said he replaced the aquastat there pretty small less than 40va i think
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Old 11-19-2008, 10:57 PM   #9
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Aquastat transformer blowing

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yoy: its the little one i belive that is part of the aquastat as he said he replaced the aquastat there pretty small less than 40va i think
So it's certain that it's blown? This one puts out 24vac? Thx.
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Old 11-19-2008, 11:00 PM   #10
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Aquastat transformer blowing

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So it's certain that it's blown? This one puts out 24vac? Thx.
i dunno the answer to that just going by what he said
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