Issue With Weil-McLain Model 68 AFG Oil Furnace


Old 11-05-07, 08:10 AM
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Issue With Weil-McLain Model 68 AFG Oil Furnace

We have a Weil-McLain Model 68 (AFG) Oil furnace used to heat our house. Furnace is located in the basement, all radiators are located one floor up (ground level) and are on a single loop (one zone).

Problem is: When I initially fired-up the furnace yesterday, the ignition was fine (tank is full with fresh, clean fuel), and the furnace proceeded to heat the water as usual. But, when the water reached around 190 degrees, the furnace turned-off as expected; however, the circulation pump continued to run. This is NOT how the furnace operated at the end of the last heating season. Usually, when the furnace reached temp/pressure, the furnace would turn-off along with the circulation pump.

Why would the circulation pump continue to run even though the furnace has turned-off? Are there any voltage/resistance check points I can check myself to determine where the fault is? I do not want to risk burning-out the circulation pump by letting it run continuously.

Any information you can provide would be greatly appreciated. Many thanks!
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Old 11-05-07, 09:42 AM
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Your circulator might be set to run the duration of a heat call. Just because the boiler shut off at 190 doesn't mean that the house was up to temp so that the t-stat would stop calling for heat. It's best to have the circ run so that every rad gets the heated water. Once the water temp drops, if the t-stat is still calling, it ramp up again to 190 or if the t-stat gets satisfied the boielr and circ can shut down.
Old 11-05-07, 01:06 PM
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Like "Who" says, it likely hit hi limit, but was still calling from the stat.
"Shoulder" time of year, so don`t worry about it.
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