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Friedrich EM18J34B - Unit will only operate in fan only mode. When turned to Cool or Heat modes nothing happens. Position of thermostat has no influence - the unit will not operate. Ideas?

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6 Suggested Answers

Joe_Rex
  • 114 Answers

SOURCE: Short Cycling

COMPRESSORS HAVE AN INTERNAL T-STAT TO PROTECT THE WINDINGS ... SOME THING IS CAUSING YOUR COMPRESSOR TO RUN "HOT" THIS WILL KICK "IN & OUT" THE COMPRESSOR DURING COLLING OPERATION AND HEAT MODE (IF IT IS A HEAT-PUMP). 1ST THING TO EASILY CHECK IS THE CONDENSOR "OUT-SIDE" COIL. (CLEN BOTH WHILE YOU ARE AT IT). THESE FANS PULL THE AIR IN AND A BLOW OUT THE COIL .... ALL THE DIRT WILL BE ON THE INSIDE. 2ND THING IS THE FAN ITSEL OVER HEATING AN TURNING "OFF" ON ITS OWN "BUILT-IN POTECTION T-STAT". THIS WILL GIVE YOU THE IRRATIC OPERATION YOU ARE DESCRIBEING. I TEND TO THINK IT IS YOUR FAN MOTOR ... EASY TEST. TURN "OFF" EVERYTHING BUT THE FAN. SET IT FOR MANUAL "RUN ALL THE TIME" POSITION. THE FAN SHOULD NOT KICK OFF !!! IF IT DOES YOU FOUND THE PROBLEM. IF IT DOES TURN OFF IT CAN BE A WEAK CAPACITOR. UNITS VARY ON WETHER THE CAPACITOR IS FOR COMPRESSOR/FAN OR HAS A SEPERATE CAPACITOR FOR EACH. CAPACITORS ARE NOT EXPENSIVE. HOPE THAT CAN NARROW YOUR PROBLEM DOWN

Posted on May 07, 2007

Therinnaiguy
  • 1420 Answers

SOURCE: no cooling after power out, indicator lights pattern not in manual

The Mitsubishi units have to be reset by turning off the indoor units by switching the remote or thermostat to off. Then turn off the breaker to the outside unit(s). After 30 seconds,turn on the breaker and then you can turn on the remote for cool. If no lights come on on the inside units, most likely you have blown a fuse soldered on the main PC board. At this point, call your technician. A goos tech will be able to wire in an in-line fuse holder so if it should happen again, you can easily replace the fuse. If you do see a light or two come on at the indoor unit but the outdoor unit does not start after 3 or 4 minutes, sounds like you will need to call a technician. Most likely you have a blown fuse on the main PC board of the outside unit. It is not an easy one to replace. Good Luck!

Posted on Sep 04, 2007

  • 57 Answers

SOURCE: fan runs constantly on cool mode

Simple Question: Did you check to see if the fan switch on the
t-stat is in ON or AUTO? If ON the fan runs nonstop. If in auto the fan cycles with the outdoor unit.
next does the fan shut off if you turn the t-stat to off?
A stuck relay should keep the fan running all the time.
Sometimes if the relay is stuck you can whack the side of the Air Handler and the connection will break.
Sometimes instead of a relay there is a stack switch.
It's a little black stack of 3 disks this is a bi-metal switch.
they do get stuck more often than relays.
The fan relay may be on a electronic board. I don't know for sure without seeing your unit.
Good Luck Phil

Posted on May 20, 2008

SOURCE: Fujitsu inverter ASTA24LCC aircon wont

Check that the gas is not leaking, that would be the most likely cause.

Posted on Jun 17, 2008

SOURCE: Carrier Weathermaker 8000Vs

This is nothing short of a circuit board fan relay of a bad motor.. to find out if the motor is good, unplugg the black & white wire , in which white =ground black=hi-speed 120volts and conect them to power -ground and see if the motor works..if does, then its the fan circuit board if not then its a bad motor...

Posted on Aug 25, 2008

  • 1 Answer

SOURCE: indoor unit runs ok outdoor unit compressor and fan do not start

Hello rfrizzell,

My unit is giving me the same alarm. If you have found the solution, please email me at danielabrewster@yahoo.com

Thank you very much.

Posted on May 10, 2009

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2 Answers

Fan doesn't work in heat mode it works on all other functions. Heat does come out but fan doesn't kick in. Outside unit is operating


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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.

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Check wiring done correctly.
Symbolsin remote: To get proper cold air set temp 23 degree and mode"cool". To get heat set temp 30 degree and mode in "Heat"
Now symbols:
1. fan leaves - Fan only
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Hiiiii..... I have samsung Thermostat AC, But i dont know how to use the warmer / heater for the same. I dont know about the model number but its one of the old AC written thermostat. Now help me out how...


Symbolsin remote: To get proper cold air set temp 23 degree and mode"cool". To get heat set temp 30 degree and mode in "Heat"
Now symbols:
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2. Rain drop- Dry mode
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2 Answers

My air handler comes on ,not the outside unit when my thermostat is in the off position even if i turn the thermostat down to 50 and have it turned off the air handler comes on for about 5 to 10 minutes...


If you have a standard thermostat the fan switch is for the air handler only. It completely over rides the thermostat for most settings. Now lets see this is what I'd expect:
fan switch on Indoor fan runs all time
Fan switch auto Indoor fan only runs when thermostat is set to cool or heat and the thermostat is turned up above room temp for heat or below room temp for cooling. In both of these modes the furnace blower comes on and stays on til the room temperature is satisfied. The outdoor unit only comes on for AC the out door unit will not come on for heat or the "on" setting on the thermostat. See exception 1 & 2 below...

Exception 1- (in a heat pump the out door unit runs in both heat and cool mode unless it has emergency heat turned on then it will not come on outside in the heat mode, and depending on the type of heat pump and furnace or air handler it is). A heat pump thermostat usually has "backup heat" and an "emergency heat" setting switch on the thermostat.
Exception 2 - On some thermostats they are made to cycle on the heat if the temperature reaches a preset temp (around 50'f usually but definitely by 40'f). This mode prevents freezing when if instance the homeowner is away or while the home is under construction. In this mode the fan inside can run but the heat usually comes on with it.
Exception3 - On some electric furnaces the heating strips may be individually controlled and thus not all come on at one time. This may give the feel of no heat especially if the room is cold.

Now there may be other exceptions but Ive tried to give you a heads up on some of the most common ones.
If you need more help please post more specifics about your unit/system as to for sure what switches are set to what setting and what is happening with each. My first though was that maybe your system is OK and you needed to know if the thermostat was working properly.

If this helpd you understand your problem would you please give me as hifgh a mark as you can. Thnaks for using fixya and good luck.

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Hello rfrizzell,

My unit is giving me the same alarm. If you have found the solution, please email me at danielabrewster@yahoo.com

Thank you very much.

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