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Old 08-17-2011, 06:41 PM   #31
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Lennox Heat Pump shuts down


Best to stay away from their price guide contract.

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Old 08-17-2011, 09:20 PM   #32
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Lennox Heat Pump shuts down


Marty, I picked up the replacement board this afternoon, installing it tomorrow. I'll admit that I did not put my gauges on the system as again, the legend states on the board "solid led one or two, board failure" but I do not know if there is any refrigerant in there. I'll check tomorrow and take pics.

The new board should be going in tomorrow so I'll check refrigerant levels before I remove the board.

Thanks for the heads up on that.
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Old 08-17-2011, 09:29 PM   #33
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Lennox Heat Pump shuts down


There is a code for open pressure switch.
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Old 08-17-2011, 09:36 PM   #34
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Lennox Heat Pump shuts down


Even when you get a board failure code. You should run the system to see if anything else is wrong. This means bypassing the board to check contactor, RV, compressor, and condenser fan motor.
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Old 08-18-2011, 06:39 AM   #35
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Lennox Heat Pump shuts down


There's no low pressure switch on a hp26 doc. The board has a space for one but they have a jumper in there. When that board gets 3 high pressure faults it locks the system out and gives a left light on and right light off code. That's why I said reset the board by removing R for a short time and then check the 65G60 fan motor.

When reading two light diagnostic codes it's what 1 AND 2 are doing, not 1 or 2.
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Old 08-18-2011, 09:50 PM   #36
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Lennox Heat Pump shuts down


Quote:
Originally Posted by Marty S. View Post
There's no low pressure switch on a hp26 doc. The board has a space for one but they have a jumper in there. When that board gets 3 high pressure faults it locks the system out and gives a left light on and right light off code. That's why I said reset the board by removing R for a short time and then check the 65G60 fan motor.

When reading two light diagnostic codes it's what 1 AND 2 are doing, not 1 or 2.

Marty, I can't begin to express how dim I feel yet how glad I am to have you on my side in this biz, thanks bud.

You were and are 110% correct. I went to the home today and took another GOOD look and sure enough "led one solid=high pressure switch lockout."

DOH!

I checked continuity throught the switch and it was there. I noticed the low pressure switch absent and the jumper wires from one spade to the other on the board as you just stated it would be. I tried to start the unit as is (it had refrigerant in it but equalized without running at roughly 150 psig so it was slightly low just judging by equalized pressures.

So I replace the board and the replacement is not the exact same as the original, one green and one red led and they begin one on/off and the other on offset to the other slow flashing, the same signal as a hp lockout. So I remove the hp wires and jump the spades (like the lp which is non existant except for the spade jumper) and still nothing. I ask the homeowner before any of this if the stat is calling and he says "yes."

After I switch the board with the home owner right there and still nothing he says, "Let me go and check the stat."

He drops the stat into auto and COOL and bam, system runs. He had it in auto and OFF!!! ARRRRGGGGG!!!!

I have pics and I'll gladly post them tomorrow. I went with the board was bad regardless.

Thanks again, Marty!

Last edited by Doc Holliday; 08-18-2011 at 09:55 PM.
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Old 08-18-2011, 10:14 PM   #37
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Lennox Heat Pump shuts down


Marty, I took another pic as best I could of a close up of the original board. Here is that one and it is very blurry but the first line on top is where I made my mistake originally. It states "Led one" which would be the left side led solid meaning board failure or at least that's how I comprehended it the first time around.


Here's the replacement board. It was simultaneously flashing slow on and off which means normal operation at this time but the camera caught it with them both off for this one.


And I then caught them with them both on in this one.


The unit.


The one HP switch.
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Old 08-18-2011, 10:17 PM   #38
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Lennox Heat Pump shuts down


And I cleaned not only that condesner but the smaller Lennox heat pump for the upstairs as well.


Thanks again, Marty.
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Old 08-19-2011, 04:33 PM   #39
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Lennox Heat Pump shuts down


Wow...you took the panels off to clean the coil..are you trying to get fired?
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Old 08-19-2011, 06:45 PM   #40
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Old 08-19-2011, 07:04 PM   #41
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Lennox Heat Pump shuts down


LOL
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Old 08-19-2011, 07:42 PM   #42
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Lennox Heat Pump shuts down


No problem doc. This is heat pump country and I work for a long time lennox dealer. Figured you would either listen or give me the old fog horn leghorn "go away boy you bother me"
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Old 08-19-2011, 08:07 PM   #43
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Lennox Heat Pump shuts down


i bet that condenser is cleaner right now than when it was new :two thumbs up:
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Old 08-19-2011, 08:36 PM   #44
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Lennox Heat Pump shuts down


In Texas everything is big
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Old 08-19-2011, 08:47 PM   #45
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Lennox Heat Pump shuts down


I think florida is heat pump country.

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