Thermostat is not turning on the central air unit.

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Thermostat is not turning on the central air unit.

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Anonymous Jul 18, 2008

my thermostat is not turning on. my thermostat is not turning on.
h20danzer Aug 03, 2008

The compressor on my portable air conditioner will not come on. All settings are right and the fan motor is running. Where do I go to get Freon in it or can I do it myself? How to?
AraceliB Aug 11, 2008

Our termosthat Robertshaw was not working properly so we installed a new Honeywell RTH7400. We wired correctly, follwing manual instruction but for some reason is not turning on, non of the options is turning on. How can we know what is the problem?

Thanks in advance for your advice

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Phillip Thomas

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57 Answers

Check electrical breakers turn them off then back on. To reset them.
How long has it not worked?
Does the fan come on if you put the fan in the ON position on the t-stat.?
Is this a heat pump? If so does any lights show up on the t-stat if you put the t-stat in emergency heat?
Give me more information.
Help me out so I can help you.

Posted on May 20, 2008

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6ya staff · Answer 1 · 1/2/2017 12:00:00 AM

Hi,
A 6ya expert can help you resolve that issue over the phone in a minute or two.
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Phillip Thomas · Answer 2 · 10/18/2008 12:00:00 AM

This sounds like your condenser contactor, contacts are stuck. They weld together if an ant or other debree get between the contacts. Turn off the electric breaker to the outdoor unit as if the outdoor unit runs without the indoor unit running you may damage your outdoor unit compressor.
I would suggest you call a service company. The part should run retail @ 30 to 40 dollars then the service call charge. This repair should take less than 1/2 hour.

Danny Clark · Answer 3 · 1/14/2009 12:00:00 AM

The blower motor kicks on when there has been a 24 volt control failure.

This usually means that a limit switch has tripped.

Most likely that would be a high temp limit switch or a rollout switch.

First, make sure the filters are clean. and the evap coil is clean. If eaither are dirty/clogged, it will partially block airflow, causing the furnace to overheat, causing the high temp limit to trip.

A rollout switch typically trips for three reasons.
1 flame rollout into the burner compartment due to poor airflow.
2 overheating af teh metal plate the rollout is mounted to, due to dirty, old, rusted components.
3 a bad limit switch.

If your unit has an LED light, count the flashes and it will hepl popint out the problem.
(locate the wiring diagram/flash code list, and correspond the flash count, with the code.)

First, check filters.

George Fleming · Answer 4 · 6/5/2009 12:00:00 AM

George Fleming

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SOURCE: Bryant central air unit fan doesn't stop.

This is a condenser fan and as long as the A/c unit is in cool mode, this fan will run. The only time it should shut off is when temperature setting is satified and the unit shuts off.

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Anjana Batabyal · Answer 5 · 6/14/2009 12:00:00 AM

Anjana Batabyal

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SOURCE: central air system notworking

Hi,,

Here are more details in addition to the prior techs articles.

www.fsec.ucf.edu/.../FSEC-CR-1044-98/pvres2.htm

Thanks

Posted on Jun 14, 2009

Thermostat is not turning on the central air unit.

1 Answer

Phillip Thomas

5 Suggested Answers

6ya staff

Phillip Thomas

Danny Clark

George Fleming

Anjana Batabyal

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