Original message
| rod
 |  "5 amp fuses blowing"
, posted Wed 26 Sep 01:52  
I have a coleman -evcon 4 ton heat pump approximately 8 yrs. old
About a 2 wks. ago I had a new control board installed because the the old one blew for some reason.
I also had new thermostat installed @ that time. A honeywell rth7400.
I apparently did not pay much attention to how the tech set-up the thermostat because of the heat outside @ the ac felt pretty good. Then as the nights started cooling down I went to set the thermostat up.
Well then I noticed it was not the tempature was not raising & the units were not shutting off. So I got to looking @ the thermostat & he had the fan set to "on" instead of auto, & the system was set to off but the outside unit is running.
So I set the thermostat to cool & the 5 amp fuse blows. I installed 2 more 5 amp fuses & they blew. So I called the tech to come back out but in the mean time I installed another 5 amp fuse & turned the heat on & it blew the fuse. Now when the thermostat is set to off & the fan on it does not blow the fuse. I can turn the fan to auto & it will go off @ the air handler but the outside unit runs
Tech shows up, looks @ the thermostat wires says they are fine, wants to know why I took off the cover where the 5 amp fuse is located & I said to change the fuse.He pulls out his meter & checks for resistance in the air handler, obviously nervous & then tells me that this problem is un related to the prior work he had done but did not say what it was only that there would be an additional charge. I told him to find the problem & if I agreed that it was a different problem I would pay him however, due to the fact I had not checked the thermostat setup to begin with when it was installed I wanted to make sure that it was not related to the first problem.
He said he did not do buisness that way & I told him to hit the road, & he still want me to pay a service call. " I did not pay him the service call"
I checked the schematic on the air handler & the board appears to be wired properly & the outside unit is wired to the shematic on the inside of the cover properly.
On the thermostat it is: red = r with a jumper to rc,
orange = o/b, yellow = y, green = g, black = common, purple = L,
white = aux with a jumper to e.
Any advice will be most appreciated.
Rod
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Replies:
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| rod
| "Re(1):5 amp fuses blowing" , posted Sat 17 Nov 02:43
Well the AC did get running however now that it is time for heat the circuit breaker will trip & the Heat pump runs on emergency heat.rod
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| acefurnacefxr
| "Re(1):5 amp fuses blowing" , posted Wed 26 Sep 07:22
You did the right thing by telling him to hit the road, its clear he dident know his ass from a hole in the ground. It would be almost impossible to sit here and tell you were the short is, you are going to have to call another company, or the same one and raise hell and insist that they send out a different tech that knows what he is doing. Also threaten to call local tv station of BBB, if they dont resolve it in a timley fashion.
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| | rod
| "Re(3):5 amp fuses blowing" , posted Thu 27 Sep 21:13
I found the short it was the green & yellow making contact@ the thermostat. I decided to run new thermostat wire inside & out.
The fuse is no longer blowing & the heat will kick on with both units however,the AC will not kick in which is why I called someone to fix it to begin with.
Thanks for your input.
Rod
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