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Old 07-17-2008, 09:53 PM   #1
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HEIL gas furnace will not start.


This is a high efficiency propane furnace with AC. The AC works fine no problems there.

When the thermostat is calling for heat nothing happens. The inducer blower will not start which should be the first thing in the cycle.
I jumpered the inducer motor and it runs fine.
The transformer is ok also.
I changed out the control board with a new one but it didn't help.
This furnace has a Honeywell Smart Valve #SV9541.
Furnace model#N9MP2125J20P1

Any help or input would be very much apreaciated.

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Old 07-17-2008, 10:07 PM   #2
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HEIL gas furnace will not start.


Is there propane in the tank? Hold the blower door switch closed, put one lead on C, or common, one lead on W, or heat. Do you have 24 volts when the thermostat calls for heat.

Sorry...at the terminal strip on the furnace.

There should be a low gas press. switch on the gas line. Is there continuity through it?


Last edited by 8 Ball; 07-17-2008 at 11:12 PM.
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Old 07-23-2008, 05:43 PM   #3
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HEIL gas furnace will not start.


Yes there is plenty of propane in the tank, but someone who worked on this furnace before me removed the gas pressure switch from the furnace. I am not sure why and the owner did not know either and the guy can't be found as the company he worked for is out of business.
But since he did this is there any other sugestions.
Thanks for your interest. Please reply.

Last edited by Mikeee; 07-28-2008 at 08:34 PM.
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Old 07-23-2008, 06:42 PM   #4
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HEIL gas furnace will not start.


90% of the time its the honeywell smart valve that needs replace. these valves are famous for being faulty.
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Old 07-23-2008, 10:27 PM   #5
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HEIL gas furnace will not start.


How about the 24 volt thing? Do you have 24 volts, at the furnace terminal strip, between W and common.
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Old 07-24-2008, 11:00 PM   #6
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HEIL gas furnace will not start.


8 Ball, I am about 20 miles from the house where the furnace is located. I have not been back to check your sugestion. I do know that the transformer is putting out 24 volts though. As soon as I go there again I will check between w and c for 24volts when calling for heat. If 24v is there what should I check for next? Thanks.
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Old 07-24-2008, 11:23 PM   #7
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HEIL gas furnace will not start.


HvacWiz, Is there any way to test the smart valve before I invest in one? Thanks
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Old 07-26-2008, 08:02 AM   #8
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HEIL gas furnace will not start.


Dont forget to instal the low gas pressure switch, to remove a safety device is unacceptable. To know its gone, and do nothing about it is worse. Test all the safeties. High limit, press. switches...etc..

Last edited by 8 Ball; 07-26-2008 at 09:40 AM.
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Old 01-14-2009, 10:25 PM   #9
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HEIL gas furnace will not start.


It sounds like your pressure switch is stuck closed. when the thermostat calls for heat, the first thing that the furnace checks for is to see if the pressure switch is open. if its not proven to be open, the furnace will not start. I have a copy of the service manual for your model furnace (n9mp2125j20p1) sequence of operation.

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