Aquastat issue Error-4

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ben
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Location: n central PA
Stoker Coal Boiler: EFM 350 with an S-20 pot (1966)
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Post by ben » Tue. Mar. 24, 2020 7:31 am

Yesterday, I noticed my hot water temp was low. Low like 120.
The fire was not out. But when I took the cover off the aquastat it said error 4.
I turned the power off several times still nothing fixed or reset.
3 hours later I went and it was working and back to normal.
I'm perplexed. This never happened before.
My plumber said lets watch it before replacing it now.
Any ideas?

 
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franpipeman
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Stoker Coal Boiler: efm 520 stoker fitzgibbons pressure vessel
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Coal Size/Type: rice
Other Heating: alpine propane condensing boiler radiant floor

Post by franpipeman » Tue. Mar. 24, 2020 7:57 am

Many Solid state controllers may take a minute or two to come up to operation status.If a power failure occur that would happen too. I mean a blip power failure. they will restart and be non operable for a minute or two . They may do self checking for flaws .I agree with plumber see if it fail again then investigate deeper. It would be good to specifically identify the type of aquastate you have for more detailed answers

 
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nepacoal
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Post by nepacoal » Tue. Mar. 24, 2020 8:11 am

Depending on how it's wired ( and assuming it's a 7224), the timer backfeeding b1 at startup could cause this... Might want to make sure the timer is not feeding before powering up the aquastat.


 
ben
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Posts: 178
Joined: Thu. Aug. 06, 2009 9:06 pm
Location: n central PA
Stoker Coal Boiler: EFM 350 with an S-20 pot (1966)
Coal Size/Type: Rice

Post by ben » Tue. Mar. 24, 2020 12:33 pm

Thanks guys.
It is a L7224/L7248
Everything is still working well today at lunchtime.

 
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McGiever
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Coal Size/Type: PEA,NUT,STOVE /ANTHRACITE
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Post by McGiever » Tue. Mar. 24, 2020 1:00 pm

ben wrote:
Tue. Mar. 24, 2020 12:33 pm
Thanks guys.
It is a L7224/L7248
Everything is still working well today at lunchtime.
Aquastat issue Error-4...RTFM may apply here... :lol:

Page 8,and bottom of page 10
L7224.pdf
.PDF | 288.4KB | L7224.pdf

 
ben
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Posts: 178
Joined: Thu. Aug. 06, 2009 9:06 pm
Location: n central PA
Stoker Coal Boiler: EFM 350 with an S-20 pot (1966)
Coal Size/Type: Rice

Post by ben » Tue. Mar. 24, 2020 5:47 pm

Thanks McGiever

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