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[plumb bob]

I have a CB5036 that is starting its third winter  right now I am burning oak and maple. My question is, the bed of coals is so hot that the furnace is bubbling but the water temp says 175-185. Now i'm wondering if the bubbling is causing air which is making my grunfoss pump at the furnace squeal. I turned the pump off and then back on and the noise stopped. Do you think the pump may be on its way out? Thoughts?

[slimjim]

Are you full of water

[plumb bob]

Yes, according to the water guage it's full

[slimjim]

I don't like the bubbling, can you check the actual water temp on the top of the boiler, is your temp guage accurate, OK central guys can you help here

[plumb bob]

I assume the electronic therm is accurate, but I will try to test the actual temp when it stops raining.Do you think the air/bubbling could cause the pump squeal? I haven't added any wood in the last 13 hours and the temp is still ok (185) and the bed of coals is about 8-10" thick. No bubbling.

[slimjim]

Yes it could make the pump go bad but more importantly it can prematurely hurt your stove if it consistantly boils in one spot inthe unit

[sabercat]

Mine does that also, I'm going to check the temp with a thermometer, mine sounds like air bubbles rising to the top. I'm full of water too.

[plumb bob]

Mine does that also, I'm going to check the temp with a thermometer, mine sounds like air bubbles rising to the top. I'm full of water too.

.EXACTLY. This morning I did take out about 15 gallons of coals to lower the bed and only added 4 pieces of wood to the remaining coals. Im hoping that lowering the heat source will help. This is my first time burning good wood and I think I will have to adjust the amount of wood I add. 4 pieces of oak/maple is lasting 12-14 hours as opposed to poplar,pine, birch that I had been burning last year.We shall see.

P.s.  no squealing as of late