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Well I checked the flu as best I could and didn't see any obstructions. Also sat a volt meter on the vacuum switch leads and had a steady 24v. How would I go about doing a water column test on the vacuum switch because at this point I think it is either that or the blower isn't spinning fast enough.

I don't have a nanometer so I tried running the system with the gas off so the exhaust blower would run while I put an ohm meter on the vac switch. When I did this the vac switch would close the circuit and not go off, only with the burner on would the vacuum switch shut off. Could a partial...

Help, it seems my heater malfunctioning. The exhaust blower will turn on then the burners will light and run for two minutes, then the vacuum switch will shut it off for about ten seconds and from then on it cycles for a minute on ten seconds off the entire time the heater is running.