2nd time it broke in ten years, first they said it was a mother board replacement, now, this time it won't operate at all. any tips for determining cause of malfunction, no motor running, no heat at all.Post created: 2013-04-14 Type of Equipment: Furnace Views: 220
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On 2013-04-14 JB wrote:
Well the obvious is to check the circuit breaker to be sure it hasn't been tripped. You can also try cutting power to it and see if that resets the furnace. The one caveat to this last trick is that if the furnace does come back on there was something that caused a safety feature on the furnace to trip such as a limit switch or some similar feature. If that is true, then you will need to determine what the cause is just to be sure that the furnace is running safely and the safety feature won't be tripped again.
Also, have you removed the front panel recently? If so is it pressed all the way on. This furnace may have a switch that will not let it run of the front panel is not securely fastened. There is also very likely a reset switch on the front of the furnace burner that could have been tripped. Generally these are red and near the burner.
There are also very sensitive safety switches inside the furnace that can trip for improper air flow or gas flow, however, most of these would only limit the ability of the furnace to fire up and not cut power or not allow the blower to start and so on.
Beyond these relatively simple and probably obvious problems there could be a serious enough issue that a safety feature in the furnace will not let it power up at all. If this is the case you need to bring in a certified HVAC tech to diagnose and repair the problem.
To keep legal happy, let me just say that I am not an HVAC contractor, and you should never even look at your furnace without having a qualified, liability accepting HVAC contractor present. To keep sales happy, let me just say that you can find an HVAC contractor that's happy to take your money here: http://www.furnacecompare.com/perl/find_contractors.pl.