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Carrier thermostat Hello, My Carrier electronic thermostat is connected to a heat pump.  It was set to the COOL position during a summer thunderstorm when the AC suddenly began running no matter what the SET temperature was.  It works normally when I change it to the AUTO position.  The HEAT and EHEAT positions work normally. I tried cutting power to the unit for 2 days, after which it worked normally even on COOL, but after a short power failure it resumed the problem of running the AC continuously. I keep it on AUTO now, and it works fine for both heating and cooling.  Any ideas on making it work on the COOL setting again?

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Re: Carrier thermostat

I hate to say it but Ive had trouble with Carrier's Tstats doing similar improper things. Unfortunatly the only repair is going to be replacement of the whole tstat. I recommend Honeywell's FocusPRO or VisionPRO tstat. Ive yet to have one fail and they have a 5yr warranty if they ever do.

Posted on Nov 26, 2007

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I am new to a heat pump. The thermostat has an 'auto' setting and an 'on' setting. I am confused as to which one to use for heat. Can you help me?

n most heat pump thermostats you have two control switches and the temp setting. One control switch will say "Heat", "Off", "Cool" while the other says "On" and "Auto". The three position switch is for whether you are heating or cooling. The two position switch is for the fan control. "On" will make the fan run constantly whenever the three position switch is in HEAT or COOL mode. Some people use this to circulate air at all times. MOST people use the AUTO mode, where the fan is controlled by the circuitry and runs during the times of heating and cooling only.

Oct 16, 2015 | Air Conditioners

1 Answer

How do I connect a 24v damper motor with 6 colored wires red white yellow green blue black to NO COM NC terminals.

Choose two colors of the thermostat wire, and connect them to the NO and COM and connect them to the zone control board leads for the zone intended. Almost all zone valves spring return open when deenergized. So ensure the zone valve is open with the system is off. At the base of zone valve there is a set screw that needs to engage the damper valve shaft in the open position with the motor in the spring release position. Most zone valve are 90 degree moment from full open to full shut. If you have a Carrier zone valve, they go full open to full shut in 45 degrees of motion. Your open stop need to be set so the valve stops in the full stop position.
To help understand the operation of a zone system, say you have 2 zone system and zone 1 thermostat initiates a heat or cool demand. Zone 2 valves energizes and shuts and zone 1 stays open and allow air to heat/ cool zone 1. If zone 2 thermostat simultaniously initiates the same heat/cool demand, the zone 2 valve opens and both zone heat/cool. When either thermostat is satisfied the opposite zone valve closes and when both thermostat are satisfied both zone valves open.
Hope this helps you understand zone operation. The same works for higher multizone systems.

Jul 27, 2014 | Honeywell Motorized Small Rectangular Hvac...

1 Answer

Honeywell thermostat blank screen on cool

I wonder if they shorted a wire a during install. That is where I would begin.

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Heat comes on when the temperature setting calls for cool.

getting heat in the cooling mode leans toward the reversing valve in the outside unit. it changes the flow of refergerint so that the hot air you get outside in the summer is blown inside in the winter. another possibility is that the reversing valve isn't getting 24v check to see if you have 24v at O and C either at the t-stat, furnace, or the outside unit. if you check at the furnace rember the safty switch for the lower door if that switch is open you will have no power. i would look at the t stat first if you have 24v there go to the outside . 24v present outside will mean a bad valve or board, no 24v means a bad or broken conection in the control wire between the stat and the outside unit(usally the orange wire)

Jul 10, 2010 | Carrier Air Conditioners

2 Answers

A/C does not cool like it used to, unit runs

sound like your system is under sized. for every 400 sq ft of living space you should have a ton of ac or 12000 btus. also check and see if your attic fan is working. any drafty windows or doors. your supply temp should be at least 20 deg colder then your return temp. also check your filter should be changed every three months this will help with air flow.

Jun 07, 2010 | Carrier 38CKC042 Air Conditioner

1 Answer

New heat pump system freezing, questioning wiring.

W1 and E on stat need tied together. When W1 comes on wire where all heat elements come on. On the outside unit defrost board set the 45-60-90 to 45 and see if that takes care of the frost problem.

Jan 03, 2010 | Air Conditioners

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Carrier thermostat reading stuck on 50 but doesn't work

If it is Carrier tstat. Some have resets other dont. Kill power to insid unit. WAit five minutes turn back on. If it has batteries take them out. But the storm may have damaged the tstat. I had a thunderstorm damage 11 tstats in one building. You can buy a tsta at Home depot that will work and they are easy to wire. Just make sure you get the coorect tstat. If the unit is straight cool electric thats the easy one. A heat pump you need a Tsta with two stage heat one stage cool. You can pick one up for about 25 to 30 dollars. Please call back for more help be glad to assist.Rusty

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Only blows hot air inside

Set thr thermostat to AC instead of HEAT.

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