Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater
Had the air on for a few days then it cooled off so we turned it off. Ice has formed on the unit where the wires from the house & unit meet.
Sounds like the internal thermostat is stuck causing the unit to think that it is not cold.
If you would like to tackle it yourself it is usually a part of the Expansion valve, witch will require opening the system. I suggest a service professional as Freon is hazardous, and being wrong is expensive.
It could just be that the rheostat on he control knob is going bad BUT that wouldn't cause Ice to form on the Unit.
Posted on May 15, 2014
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Posted on Jan 02, 2017
Sounds like it may have lost power. Check the breaker and the fuse at the furnace. If they are all in the on position and working then it sounds like you may need a technician. If the display is blank on the thermostat you may also want to replace the batteries.
Posted on Jun 17, 2008
check to see if the B terminal is on the new t-stat if connect to it , but this terminal refers to heat pumps and is normally use to energize the reversing valve on the outside unit and not used on ac units , but normally the tag O/B is the same terminal on therostats
Posted on Oct 26, 2008
Clean the filters of the air conditioner. Also, if the unit has been running for a few years without proper maintenance you must expect lots of dust in the evaporator unit. This is usually easy to clean with compressed air.
Posted on May 21, 2009
If unit worked before you tryed changing t-stat then its possible the t-stat wires are shorting each other out.take t-stat back off cut back wires a good 6 to 10 inches or if you dont have that much wire to play with just cut back as far as you can and make sure there is no bare wire touching each other ,then just to test unit to make sure its working ok twist yell.,red,green together this should bring both units on and should blow cold.if this works up to this point on the new stat read directions closely there might be a jumper wire in the stat that needs connected usually from y1 to w1 you would install a jumper wire .see if this helps if not write back i have 1 other solution.i hope this helps
Posted on Sep 15, 2009
hook up the blue wire in the furnace cabinet where the blower section and the other thermostat wires are connected to the furnace. the thermostat you have uses a common wire from the thermostat to the furnace and this needs to be hooked up in the furnace otherwise you will have the problem you are having.
Posted on Dec 07, 2009
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