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Posted by JohnVT on December 26, 2009 at 01:19:08:
I have a 20 year old Trianco Heatmaker that has been locking out on low limit when calling for hot water. I have not used the furnace for heat. Tonight the gas would not turn on after power-on reset, although the fan and pump seemed to turn on.
I bypassed the gas stack switch and nothing changed. I bypassed the water pressure switch (this is attached with tubing across the pump) and the gas did come on but it made a knocking/clanging sound and I immediately turned the unit off.
Where do I look first? Any advice?? thanks
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