Aquastat

BillW@honeywell

and take it back to your distributor. Have them contact their Honeywell rep, and have the rep send the control in for special testing. The control will be warranteed, but it should be checked to determine what happened. Do you have a date code?

don_140

Aquastat L8124AC

Wondering if anyone else has had any problems.

I had two recently would not shutoff the burner on high limit,and one that would not even bring the burner on.

Sensor in place with paste and no damage to the tube.
Did they forget to put a charge in the sensor?

Thats it for me..I'm going to a secondary limit as well.
Scary!

Al Letellier

L8124

Have had only one fail on low limit and two on the high limit side in the last 15 years or so. Pretty reliable control in my book.

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Unknown

I agree

I've installed hundreds of 8124A aquastats and never had a problem yet . Had a few 4081B aquastats overshoot the high limit by 30 degrees or more , but they're very far and few between .

Don , with the runaway burners , did they have a constant hot leg bypassing the aquastat ?

don_142

Hello

Ron...no bypass.

Unknown

Now that's serious

I bet Honeywell would like to take a good , hard look at those controls . I asked about the hot leg because we've had similar situations with the new Riello burner and electronic air damper . I do not like having a hot wire going directly to the burner .

Did the problems occur on the aquastats right out of the box ?

don_142

One

did on a brand new boiler install.The other one did 8 months
after install.

And I'm returning to one tomorrow that will not bring in the
burner it been in place for about a year now.

Just trying to find out if its my Irish luck or if there been a problem.

Thanks.

jeff_51

didn't someone else have a similar problem

like this a couple of months ago that was posted here? or is my memory bad?

Ted_4

Yeah,

I asked a question whether Wallies thought a secondary high limit was a good idea. I was referring to an install in vacation home where no one would be around for long periods to catch any boiler mischief. The wall said No, controls like the 8124 were reliable enough. But I went and installed the secondary limit anyway. I have been sleeping better for it. And now you guys say there have been problems...?

don_143

Hi Bill.

the one last year happen on a brand new install,not my install but another hvac contractor that the owner was out
doing his duty in iraq and they were told to calls us if they ran into a problem.

We had the meter on the burner side with heat stat turn off.
low limit was set at 140 and she kept climbing and started making noise and the relief did its job.

We then turn the stat on so the high limit would take over and then disconnect the circ and she would shut down on high limit.
Then we power the circ again and disconnect burner and the temp drop way below the low limit setting and the circ would
never shutoff.

So we assume it was a malfuction in the low limit stat.
When we fill out the warranty paper,we put down on another paper what we did as I stated here,and ask them to please
let us know what they found..no word yet.

I always assume if the low limit stat fail the high limit would take over..but that does not appear to be the case if the stat not calling.

Are my assumption correct? TIA.