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Freefall_Doug 09-03-2011 09:36 AM

Bad Generator Connection Fried the Transformer in my Honeywell L7224u1002.
First post, and my title should probably read bad generator connection fried my Aquastat!

I am having a bad week! I fried the original aquastat and burner control for my oil burner earlier this week with a junk craiglist generator that had a nuetral problem.

I got a new generator, 6 days and counting with no power, and my friend installed a new Aquastat, a universal Honeywell L7224u1002.

The furnace was operating great again.

Fast forward to this morning. The 4 prong twist lock backed out of the generator outlet slightly. I think this lead to one contact, probably the nuetral, not being full seated.

I knew instantly I had an issue when I walked in the house and the lights weren't working.

Turned the generator off, it was only like this for a minute or two. Find that the plug is loose, reseat the plug.

All lights and fridge work.... check the boiler, burnt electric smell. No read out on the aquastat digital readout. The transformer that is inside of the aquastat shows signs of overheating.

The unit is fused, but the fuse didn't blow. I think the transformer fried itself!

So now I am again without hot water and out another 170 bucks or so for a new control!!!

Is it possible to take the circuit board out, desolder the transformer, and replace?

beenthere 09-03-2011 10:19 AM

Never tried it myself.

PS, I fixed your thread title.

Freefall_Doug 09-04-2011 09:28 AM

Any thoughts?

I am still going to buy another brandnew Aquastat to use fulltime, but with as sensitive as these things are it would be great to get this first one working as a backup so I don't end up with no heat in the middle of the winter. :no:

beenthere 09-04-2011 11:33 AM

I'd get a standard mechanical one instead.

Freefall_Doug 09-04-2011 11:45 AM

Can you suggest one? The boiler is a Columbia Emerald EM-100. Hydronic heat with two zones.

The original aquastat was not solid state with digital controls.

beenthere 09-04-2011 12:05 PM


Freefall_Doug 09-04-2011 01:37 PM

It originally had an L8124... the plumbing supply people are the one that said that was out of production, and a L7224u1002 would work well.

Is the R8124 similar to the original L8124? I can find L8124's on google but not the other way around. :jester:

beenthere 09-04-2011 05:59 PM

Sorry, I mistyped. L8124 is what I should have typed.

L8124s are still available. Many places stopped carrying it. I get mmine from an HVAC supply house Called Sid Harveys.

fy171 09-05-2011 09:22 AM

use a honeywell AT140A1000 and connected the 24 volts that was connected to were the old transformer was connected on the board (remove the bad transformer first)

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