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Old 10-03-2012, 06:23 PM   #1
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Can't locate fuse on heat pump circuit board


My home' s air stopped working. Checked heat- does not work not even fan. Fairly new home (less than 10 years old) Thermostat seems to be fine, can hear click sound when turning ON heat or air. Been trying to locate the fuse in heat pump's box to no luck. It has Honeywell circuit board. Could I get help in finding the fuse location? I snapped couple of pictures of the board.
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Old 10-03-2012, 06:46 PM   #2
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Can't locate fuse on heat pump circuit board


Probably doesn't have a fuse.
If it did, it would be in line with the fan relays.
Check the back of the circuit board for damage.


Last edited by Houston204; 10-03-2012 at 07:08 PM.
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Old 10-03-2012, 06:47 PM   #3
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Can't locate fuse on heat pump circuit board


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Originally Posted by Ron2000 View Post
My home' s air stopped working. Checked heat- does not work not even fan. Fairly new home (less than 10 years old) Thermostat seems to be fine, can hear click sound when turning ON heat or air. Been trying to locate the fuse in heat pump's box to no luck. It has Honeywell circuit board. Could I get help in finding the fuse location? I snapped couple of pictures of the board.
why are you looking for a fuse...do you have line voltage.....
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Old 10-03-2012, 07:24 PM   #4
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Can't locate fuse on heat pump circuit board


I’m no electrician but shouldn’t you check the main fuse box to see if a breaker is tripped?
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Old 10-03-2012, 07:35 PM   #5
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Can't locate fuse on heat pump circuit board


Thanks for the quick response. Breakers are fine. Heat pump and outside air unit's capacitors are also checking good. Seems to be just blown fuse or is it possible they have this board without fuse. In that case any electric surge or short circuit could blow the board. Also outside unit is
getting power, I was able to run the fan with direct contacts.
How do I check if circuit board is good?
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Old 10-03-2012, 07:36 PM   #6
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Can't locate fuse on heat pump circuit board


Quote:
Originally Posted by carmon View Post
why are you looking for a fuse...do you have line voltage.....
Yes I have line voltage.
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Old 10-03-2012, 07:41 PM   #7
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Can't locate fuse on heat pump circuit board


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Originally Posted by Houston204 View Post
Probably doesn't have a fuse.
If it did, it would be in line with the fan relays.
Check the back of the circuit board for damage.
You think circuit board is bad? Do I pull out the board, and what
damage I am checking. Visual or with multimeter? I am mechanical
engineer but know little bit about electrical and HVAC
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Old 10-03-2012, 07:56 PM   #8
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Can't locate fuse on heat pump circuit board


the clicking sound you hear....is it in thermostat,,,,if so confirm 24 volts on control board...and transformer...
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Old 10-03-2012, 08:12 PM   #9
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Can't locate fuse on heat pump circuit board


Yep, see if your transformer is putting out 24 volts.
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Old 10-03-2012, 08:14 PM   #10
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Can't locate fuse on heat pump circuit board


If it is the stat clicking check for 24VAC between R and C.
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Old 10-04-2012, 12:39 PM   #11
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Can't locate fuse on heat pump circuit board


can any of the low-voltage wire connections on his circuit board be jumpered and have the unit start for testing purposes? Whichever one it is, if the unit starts, the problem will then be between the control board, and the stat inside the house. If not, then it's this circuit board, pending it's got power
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Old 10-04-2012, 04:03 PM   #12
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Can't locate fuse on heat pump circuit board


R = 24 volt power
G = fan
W = heat strip
Y = compressor
C = 24 vac common

Jump R to G to run the fan.

Avoid jumping R to C since this would be a short and would damage the transformer.
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Old 10-04-2012, 06:35 PM   #13
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Can't locate fuse on heat pump circuit board


Quote:
Originally Posted by Houston204 View Post
R = 24 volt power
G = fan
W = heat strip
Y = compressor
C = 24 vac common

Jump R to G to run the fan.

Avoid jumping R to C since this would be a short and would damage the transformer.


Thanks all. I'll try tomorrow. Good thing it's in seventies here and I don't need heat/ air for few days and I can keep testing.
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Old 10-05-2012, 01:58 PM   #14
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Can't locate fuse on heat pump circuit board


Quote:
Originally Posted by Ron2000 View Post
You think circuit board is bad? Do I pull out the board, and what
damage I am checking. Visual or with multimeter? I am mechanical
engineer but know little bit about electrical and HVAC
Cool! I am an electrical engineer! Similar thing happened to me a month or so a go with my ignition board. Visual inspection can tell you a lot. On mine a trace on the board had burned through. I repaired the trace, and it's back running fine. See link below for photo of what the burnt trace looked like (in this case).

Blower motor in AC unit not coming on

Last edited by Big John Studd; 10-05-2012 at 02:01 PM.
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Old 10-09-2012, 04:49 PM   #15
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Can't locate fuse on heat pump circuit board


Quote:
Originally Posted by beenthere View Post
Yep, see if your transformer is putting out 24 volts.
Yes that is it! I should have checked first thing, 0 output from the sec. Also little burning smell. Ordered new transformer on line. My only concern is if something else could be wrong on the circuit board. What if I install new transformer and it also fries. Thanks guys! great forum!

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