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Set it to Cool. Then measure the voltage at the low voltage terminal strip on the furnace/air handler, R to C should read 24 volts, R to ground should read something, R to Y should read zero and both indoor and outdoor units should be running. If they are not, turn the power OFF and place a jumper wire between R and Y on the terminal strip, then restore the power. If everything starts, either the thermostat is bad or there is a broken wire between the air handler and the stat. To prove the wire is good do this same test at the stat, if everything starts after jumping R to Y the wire is good and the stat is the problem. Prior to all of this, make sure the outdoor unit circuit breaker is on , the fuses outside are good and power to the condensing unit is present.
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Can a faulty thermostat effect your central AC unit?
can a faluty thermostat affect your central ac working?
What happens when a thermostat on an air conditioner system goes bad?
If it totally dies, the AC unit will not operate. If it is "failing", the unit will not maintain the proper temperatures.
Why isn't the fan on your outdoor AC unit coming on when you have the thermostat set to cool?
1. Bad fan motor 2. Bad fan capacitor 3. Contactor bad 4. No power to outdoor unit.
Can a bad thermostat make ac blow hot air?
No. The thermostat is not likely to be the cause.
Can you have two thermostats for one AC unit?
yes, if the ac unit has 2 zones, you will need a thermostat for each zone. if the ac unit provides both ac and heat, you can connect a thermostat for each. not a good way to go. better to use 1 therm in that case that has a heat-cool switch on it so the unit is not putting out both heat and ac at the same time.
Why won't the thermostat turn the ac on and off?
You obviously have a problem with your ac unit which cannot be dianosed here.
What is wrong if a old ac unit never shuts off when thermostat is in auto do you think its the relay?
The AC unit is fully controlled by the contactor. If the unit turns off by thermostat control such as setting tstat to off, the contactor is ok. The thermostat could be the problem though. yeah i understand that but when i say old unit i mean its so old that the thermostat only have two cables the red one and the white one! the auto and cont the unit has it in the indoor unit!!!
Will a bad thermostat cause the ac to not work on a 2000 ford focus?
No.
Ac works but no heat blows cold air?
Bad Thermostat
Why does your ac unit turn on and off?
Your a/c unit uses different relays(switches) that are energized when the thermostat calls for A/C.
What causes the outside AC compressor unit not come on after 7PM?
Improperly programmed programmable thermostat.
Why does your ac unit not cycle off and on?
Bad compressor
