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Armstrong 4PHP13E36P runs after heating element cools

I need to know where to adjust the length of time that an Armstrong 4PHP13E36P-1A blower runs after the heating element shuts off. The unit blows cold air into the house after the heat stops, which cools the house, causing the thermostat to start the whole cycle again. This is clearly wasting energy and wearing out our unit prematurely.

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  • peyton thompson
    peyton thompson May 11, 2010

    the time is preset on the fan relay if the fan is not shutting off after 1-2 minutes then the fan relay is bad and needs to be replaced.

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There may be pins on the circuit board inside the air handler that you can adjust. First turn off the breaker then look inside at the board. They may say 30-45-60-90 etc. Put the pin on a lower number. Do you have a digital or programmable T-stat? There may be a setting in the T-stat setup program that allows for blower delay also. consult you installation instructions. Last if the blower isn't turning off at all then the relay on the circuit board is stuck closed and should be replaced.

Posted on Mar 10, 2009

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Posted on Jan 02, 2017

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If your furnace is relatively new, as in 10 years old or less, there should be a field adjustable 'cool down' cycle. On the circuit board there should be a dip switch or series of dip switches with 30, 60,90,120 indications. These numbers represent the length of time the relay on the circuit board allows the fan to run AFTER the thermostat satisfies. You may be able to adjust the time frame down one position from where its positioned now.


The second possibility, if the blower never shuts off at all is that the relay itself could be stuck in the closed position and keeping the fan on.

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Why won't it start?


It should automatically restart.....BUT what happened is that when you unplugged it, you cut off the blower at the same time you cut off the heat element(s). The way it is supposed to work, is the thermostat cuts power off to the elements and the fan continus to run for a per-determined amount of time to remove al the heat from the elements. Then another 'fan control switch' shuts off the fan once the 'residual' heat is removed from the heater. Without that 'cool down' cycle, the hot element had enough 'residual' heat in it to trip off the 'thermal overload' in the circuit. The 'thermal overload'... or...'hi limit'...or...'hi temperature control' is resposible for shutting power off to the element(s) in the event that the blower fails.

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1 Answer

Why won't it start?


I copied and pasted this answer from your other question as I thought it was the same one Sherry.... Hope it helps you.

It should automatically restart.....BUT what happened is that when you unplugged it, you cut off the blower at the same time you cut off the heat element(s). The way it is supposed to work, is the thermostat cuts power off to the elements and the fan continus to run for a per-determined amount of time to remove al the heat from the elements. Then another 'fan control switch' shuts off the fan once the 'residual' heat is removed from the heater. Without that 'cool down' cycle, the hot element had enough 'residual' heat in it to trip off the 'thermal overload' in the circuit. The 'thermal overload'... or...'hi limit'...or...'hi temperature control' is resposible for shutting power off to the element(s) in the event that the blower fails.

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As I just told one other questioner. These types of electric fireplace heaters were not designed to run for long periods of time. Their heat output is not much more than a blow drier. However, this is not just a problem with CharmGlo, it's with all the manufacturers.

Here's the problem ... The heaters work by taking in cool air, heating it and sending it back out via the blower. Over time, the heating element and/or blower become clogged with dust, lint and/or pet hair. This makes the heating element work harder and it over heats. Either burning out the heating element or the thermal overload switch or both.

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