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Have a Intertherm M7RL 072A BW. The question is when there…

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Have a Intertherm M7RL 072A...
Have a Intertherm M7RL 072A BW. The question is when there is a call for heat the Blower motor will run every once in a while for a minute or 2 then run the normal heat cycle. Any ideas, already swapped out thermostats.
Submitted: 6 months ago.Category: HVAC
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1/2/2018
HVAC Technician: airheatman, HVAC Technician replied 6 months ago
airheatman
airheatman, HVAC Technician
Category: HVAC
Satisfied Customers: 9,181
Experience: Furnace, A/C and heat pump specialist.
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Are you saying main lower comes on before the ignition process begins?

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Customer reply replied 6 months ago
not Everytime though. Just every once in awhile according to the homeowner. I haven't witnessed it yet.
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

If blower is starting before the inducer ,igniter or burners, You have a board that is starting to fail.

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Customer reply replied 6 months ago
Okay, any thoughts on I just noticed alot of there Registers are closed.
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

You can close up to 30 per cent of registers without causing adverse effects but if too many are closed we would get an overtemp limit error.That would not cause blower to come on before ignition

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HVAC Technician: airheatman, HVAC Technician replied 6 months ago

These boards as you probably know develop stress cracks and will start giving erratic operation .It will continually get worse unitl eventually fails all together if that is the case.

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Customer reply replied 6 months ago
Just wondering because unit is only 4 months old
Customer reply replied 6 months ago
After new board still produces the same problem.
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

Let me grab a manual and see if there could be anything telling fan to come on. Meanwhile lets do this.

Disconnect the thermostat wires from the board. Then jumper R to W and see if that blower comes on first or just the normal sequence beginning with inducer.

Also tell me the model on the thermostat you are using

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Customer reply replied 6 months ago
I'm not there anymore, it was cycling just fine when I was there. But homeowner says it still cycling like that. But it never does it in front of me. There is a little prong connector on the board that has different positions, but nothing in the manual about it
Customer reply replied 6 months ago
I was using a Honeywell 6000 but now using a Honeywell T4 Pro
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

Do you know what thermostat is installed. As I think it over the though comes to me that perhaps if the thermostat has a setting for "Fan controlled by thermostat or Fan controlled by furnace". if that setting was on electric, it could e confusing the board

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Customer reply replied 6 months ago
No it was left on 2
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

I would try changing that to 1.

I am looking now to see what those pins do.I think they control how longer blower stays on after burners shut down

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Customer reply replied 6 months ago
No there is a whole different pin section for blower off delay for heat
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

I am still looking through manuals. I do see that those pins are in the "speed select" block on board so probably a way to chose how many cfms fan moves so they can be adjusted to move more or less air as needed.

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Customer reply replied 6 months ago
I will try that tomorrow, thanks.
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

Let me know if that solves. Hate you changed board but at least it was a warranty issue.Wish I had thought about the thermostat setting confusing the board

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Customer reply replied 6 months ago
That thermostat setting can only be adjusted if it is set up for electric heat? I'm lost with the thing
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

I see that now.

I think I would try to call Nordyne directly and see if they have records of other people having same issue and if so what solution they suggest

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Customer reply replied 6 months ago
That's what I have done but they say they will return your call and it takes them a day to call you back. And then of course your not on that job.
HVAC Technician: airheatman, HVAC Technician replied 6 months ago

That sucks. I have been there and done that. Wish I could be more help

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