Wood Boiler won't heat up

Old 01-22-15, 06:34 AM
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Wood Boiler won't heat up

I have an outside wood boiler (first winter with it, used, just bought house in Sept.), it worked fine until New Years when it stopped heating up. I've had it professionally cleaned, leaky door replaced, and replaced blower, even bought new dry wood, but it burns fine with the door open, but once it is closed, the fire dies down to almost nothing. The people who installed it are the ones that have supposedly cleaned it, but it is still not getting enough air to burn, it only gets up to maybe 140 if I am lucky. Any thoughts?
Old 01-22-15, 06:50 AM
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Your description of the problem points to the vent. What's the make & model of the unit? Have you googled the problem using that information? Chances are that you are not the first to have that problem.
Old 01-22-15, 09:03 AM
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When you bought the dry wood, how dry was it. Some will sell seasoned wood that still has a lot of moisture in it. That's one possibility.

Good dry wood will burn without a lot of help, so if it isn't getting hot with the door closed then there is a restriction on the input or output. If the restriction was on the exhaust side it probably wouldn't burn well with the door open. While we wait for the make and model Pulpo asked, look for a damper on the input, something that shuts down the supply of air.

Old 01-22-15, 10:08 AM
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You said you had a new blower installed but is it running? If not check that the boiler has power and that the thermostat is calling for the blower to turn on and that power makes it to the blower.

Wood boilers are designed to naturally barely keep the fire going. Then when it needs to make more heat the fan turns on to heat up the fire. Once the set temperature is met the fan turns off and the fire is starved for air and dies down considerably.

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