Furnace fails to fire on occasion, then fires Immediately when Re-set is pushed


Old 01-08-13, 12:28 PM
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Furnace often fails to fire: fires Immediately when Re-set is pushed

(40+ yrs old H.B. Smith Boiler, "A.B.C." burner, Carlin transformer/igniter, 1 yr. old burner motor, furnace just professionally cleaned, new nozzle and electrodes adjusted, CAD/electric eye was cleaned, new filter on tank outlet, tank full, hot water b.b. system....)

Our furnace will run for two days, or two hours, (no pattern), then fail to fire. Starts immediately when re-set button is pushed, and runs smoothly with good draft. Possibly fails to fire more often when demand is high (cold nights, e.g.). Very grateful for your suggestions on possible causes:

One friend suggests "flat spot" in burner motor (motor new 1 year ago). I wonder if Carlin transformer/igniter (approx. 15 years old) gets "tired" when demand for heat is frequent (3 zones, b.b hot water) on cold Maine nights, and if I should replace transformer/igniter.

Furnace always fires immediately when "re-set" button is pushed. "Back puffs" just for a second when it fires .... draft flap always opens "in" almost immediately.

Very grateful for any suggestions you may have. Thanks! Mike in Maine

Last edited by mainesongwriter; 01-08-13 at 12:53 PM.
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Old 01-08-13, 04:13 PM
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It could be the 'flat spot' issue... happens...

Could be the ignitor, could be the coupling, could be electrode adjustment, could be ? ...

If you JUST had it cleaned and now it's acting up, you should call the guys back and they should not charge you (IMHO).

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