Janitrol/Goodman will not shut off

[rbrown3553]

I have a Janitrol heat pump three zone system with a 5 ton and 2 3.5 ton units cooling 5500 sq ft. When may a/c is running it never shuts off. I just got a $843.00 electric bill for the month of May '05.
Issue is: The thermostat is set at 78 degrees, once the temp reaches 78 degrees the units will not cycle off. Runs continously. Need Help.

Could I have a stuck contactor? I did notice there were spider webs in the wiring area on the outdoors compressor unit?

Current example: Downstairs 3.5 units reached the 78 degrees at 10:38 am as of now (10:58) still running. I can manually move up the temp to 79 and system shuts off.

I have never had a electic billover $500. until this month.

Orginally I had this problem with the units 3 threes ago. unfortunally the service guy that fixed it passed away. Several service people have looked at it and they say it is fixed then once a load is put on it, it happens again.

[Black Adder]

What kind of tstats are on these units. If you set the tstat to 79 will it cycle normally? Will it shutdown when temp reaches 79?

[RoBoTeq]

This is a duplicated post/thread. Please stick to one thread.

[rbrown3553]

I have LuxPro Tstats. No it does not cycle off when it reaches 79.

Example:

Set at 79 once t-stats show 79 is will take from 29 to 25 minutes for the units to shut off. I have a degree swing set at 2.