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Control board - Purple 3 fuse keeps blowing

Falcon67

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Joined
Jun 11, 2009
Messages
18,371
Location
Merkel, TX
I can buy 30 amp contactors for $6.83 and 40s for 10$ right now, it's the $40k service truck with $20k in stock driven by the tech making a decent wage with decent health insurance and received better then average training that drives the cost up.

PelicanPines keeping a spare contactor and maybe even capacitors for your units might not the worst idea ever.

This. The old Goodman ate one more cap before we retired it. I could have bought one through a friend for about $40~50. But, what if that wasn't the real issue? So $250 for an after hours call in the summer when cool evening means 90F - that's just what it costs. Part of that trip was used to take a over-all look at the system, which gave us the indications that replacement time had come.
 
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My Old Tools

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Joined
Jun 4, 2014
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5,438
Location
Hamrick Lake, TX
Test the capacitors.....first thing to check every time. With 3 identical units I keep a spare on the shelf. At 10 years I have now replaced the cap in all 3.
 
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Big Daddy Chop Shop

Well-known member
Joined
Jan 13, 2016
Messages
233
Location
Hope, Indiana
I am glad you are going, but your discharge air temp is still a bit high.

I might run this simple check. On the large insulated line, it should be "beer can cold" (i.e. 40 degrees or so) under the insulation, the small line should be above ambient, but not blazing hot.

Its a little bit more than a "little" concerning he did not test run it. Regardless, the price is what it is. I have seen (and followed for friends as a "second opinion") technicians who would have told you the unit was trash.

FWIW, our street rate is just shy of $150/ hr., $85 truck charge, and 5.5% enviro fee. Good help is not cheap. Sometimes mediocre help isn't either. But the bottom line is, he basically fixed it. Not saying he did you right, but the pricing isn't bad.

Why do all that when you can get free troubleshooting on the innernet?

This is true, I suppose, but please remember, I ended with "call a pro" and stand by that. Nothing like this can be diagnosed over the phone, or web correctly, reliably. I took a stab (an educated one) and got it right. I'm not super talented, or gifted, just a good guesser.

I did tech support for a few years too, its really, REALLY easy to tell a guy what to do when you are sitting in a 70 degree office, feet up, and the customer isn't hovering over you, lol. But perhaps you are right, I should not infringe on my fellow technicians livelihood. My most sincere apologies to anyone I may have cost a call.
 

nsula_country

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Joined
May 23, 2013
Messages
1,534
Location
Northwestern Louisiana
A 20 or 30 Amp contactor is NOT a $15.00 part. $99.00/hour is cheap compared to some (most) other trades...

More importantly, I'm glad you're up and running.

Tommy

I can buy 40A contactors for $15 or less from 3 different supply houses.

Control transformers less than $10.

It's the tech leaving the wires unlanded that disturb me. How did they test after replacing the contactor?

When the control fuse blows, there are MANY things in the circuit that can cause this. Toughest one I ever had was reversing valve wire rubbing (melting) on the discharge line in the condensing unit of my own heat pump within the 1st week of operation. Improperly dressed from the factory. Went through SEVERAL 3A fuses before finding that one.

CT
 
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danski0224

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Joined
Jan 29, 2005
Messages
13,432
Location
Near Naperville, IL
"Parts" and "Labor" are typically lumped together as an "Electrical Component Failure, Diagnostic and Replacement" line item on a flat rate invoice.

An itemized invoice almost always leads to the familiar "$15 part" and "outrageous labor cost" discussion that is happening here.

The typical customer (employee) has no comprehension of the costs of running a business and expects almost free service, as shown in these forums.
 

R.Anderson

Well-known member
Joined
May 26, 2012
Messages
906
Location
Wisconsin
I will say this the discoloring of the board and IC are not a good sign...... BTW sent from my Mac.

Control board is replaceable, if sold

Discoloring on these boards is normal, resistors put out heat discoloring the board over time. you can find these boards no problem. For Coleman furnaces (they are rebranded) I have had to deal with these trailer house furnaces in the past. HVAC supply houses or mobile home parts store should carry what you need if you need to swap the board. I can PM you a direct phone number for technical support for these furnaces only if you you feel comfortable servicing your own furnace.
 
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PelicanPines

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Joined
Apr 30, 2014
Messages
38,112
Location
New Jersey, USA, Earth, My own reality
I did get a new main board but did not need it. I am keeping it as a spare... I have two exactly the same zones and will probably need a board sooner or later.

It was the Contactor outside. I had it done professionally. But would be comfortable doing that fix in the future.

The guy kind of messed up by not reconnecting the outside terminals to the main board but thankfully I noticed it as the issue as he drove off and was able to fix that ... mostly because I took pictures...
 

bubinga

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Joined
Jul 26, 2014
Messages
12,744
Location
Bridgeport Ohio. (Across River From Wheeling WV)
I don't know what that was all about,
But I'm having trouble with my A/C.
Looks like I don't have power to my R terminal on the board.
I'm not getting any blower or anything when the thermostat is set to call for cooling or call for heat or manually on the fan on setting.
Jumping R and G at the board gives me nothing.
But my question right now is do all of the control boards have a fuse, because for the life of me, I cannot see one on this board.
 
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