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Error4 Ac not on at thermostat

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Faulty temperture sensor locks out heat pump.

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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I need to know if a mercury thermostat is bad will it allow the ac to come on but not the heater

need to know what thermostat you are referring to
the coolant thermostat has no connection to the ac system
if it is the ac thermostat the it maintains the cabin temperature by activating the ac compressor as required
if you are referring to climate control then that controls the heater flow to keep the ac temperature at a set temperature with the ac compressor operating all the time
so as an answer to you question , check the climate control module

Dec 30, 2016 | Heating & Cooling

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My thermostat says -AC WHAT DOES THAT MEANB

Turn your fan from auto to on at thermostat, fan should come on. If
you still get the (AC) and fan does not come on, change the batteries at the thermostat if they have them..

To see if thermostat is bad, do this.
1) Turn power off to Furnace/AirHandler.
2) Remve Bowler Door and find where thermostat wires connect to control board. Remove wires and write down which terminal they go

3)Take a wire and hook-up between R and Y. Put door back on, turn power on. Fan should come on and AC should come on.

Jul 11, 2010 | Goodman CLQ36AR49 Air Conditioner

1 Answer

Error4 code on peugot radio how do i get code back

Leave SWITCHED ON ..UNDISTURBED for an hour or two and it should reset itself

Mar 14, 2010 | 2005 Peugeot 405

1 Answer

A message "Error4" appears. The machine does not function at all. Power is OK

The best and at NO COST. Talk to the Organ Grinder not the Monkeys. I spoke to Candy who told me exactly the meaning of error4. I cured it instantly and If I had used Fixya they would have cost me a lot of money for no good reason.

Oct 25, 2009 | Candy 17 in. CS455 Built-in Dishwasher

1 Answer


check the manual see Error 4 trouble shot

Jun 20, 2008 | Haier hwr10xc6 Air Conditioner

1 Answer


a programable thermastst has different modes. in auto it can deside whether to apply heat or cooling. ac air coditioning. or you are in ac mode, but should notice the ac unit comming on. if no ac unit then of corese it won't come on :)

Jan 15, 2008 | Honeywell Programmable Thermostat Heater

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