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[DBeleskey]

I have been using my new G2 for just over three weeks now. So far I absolutely love it. It seems to do everything I had hoped it to do and more. I am heating my home of just over 3000 sq ft and DHW. Like I said its been great with the cold start we have had to the year so far. Its has been down to 0 F at night for the past few nights and only hitting highs of between 15 - 20 degrees F through the day.

Today was up to about 20 degrees and sunny so, the sun was heating up my house by itself. After the sun started to go down, I thought I would check to situation of the wood left in the furnace because I would not like to restart it in the dark. As I was walking toward the furnace, I could hear the fan running. Then when I got to the furnace the fan was off. I could hear a slight bubbling sound. I opened the front door and the fan didn't come on, which it always has. So I went around to the control side of the furnace to have a look. The first thing I noticed is that the water was hot and that the HEAT switch was OFF. I turned it back on and the fan came on again when the door was open. The wood was fine so I left it alone.

I assume that the high limit shut the switch off but what I find strange is that if it was near high limit, why was the fan running when I went out ?
I would hazard to guess that the temperature in the house was warm enough that the heat from the boiler was not used all day except for some DHW.

Maybe I should not be stoking it in the mornings when the sun is going to shine ?

Could there be an issue or am I just worrying?

[slimjim]

That’s a really strange one, the fan doesn’t run if the heat switch is in the off position, at least it’s not supposed to!

[mlappin]

Odd, you’d just need to fill less on warmer days, it shouldn’t overheat just because it was warmer, some use their gasification boilers all summer just for DHW.


Try powering down for a few minutes and restarting it, sometimes just have to power cycle like a modem.

[slimjim]

I think you are talking about the wrong boiler Marty, unless I’m mistaken, it’s a Polar which does not use a fancy control to monitor temperature settings, just simple Honeywell aquastats. It’s possible that the control aquastats may have briefly stuck closed but that would be very rare. Check the control setting itself to be sure that it’s not too close to the overlimit setting. In warmer weather I like to set them at least 20 degrees below the high limit.

[DBeleskey]

Well, it ran great last night with no issue. I took some pictures of the controllers. I think the main controller is letting it get to hot before shutting off and it just keeps getting hotter slowly though the day when not used much until the high limit shut thing down. Not sure though. Here are the pictures of the controllers and the temp gauge outside...

[slimjim]

Yup, I think you are on the right page, cut the control back to 180 and see if the issue persists.

[DBeleskey]

I will give that a try and see what happens.
If I set it to 180 how much will the temp drop before it starts to heat again ?

[slimjim]

There should be a differential setting on the aqua stat that is adjustable, they are normally set at 20 degrees I believe.

[DBeleskey]

Great...thanks guys.
We will see how it goes now. I moved it down just a bit, hopefully that works. Only happened once so hopefully no more .