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No heat generated from the inside unit in Misubishi Mr. Slim

I have a Mitsubishi Mr. slim MSH15EN. The unit is in the heat mode and the defrost and power lights stay on, the outside unit is blowing the fan, but the indoor unit never produces ANY heat even after keeping on for hours. I've changed the remote batteries, reset the remote, cleaned the unit, etc.

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I have the same problem with the same unit. I checked my defrost thermistor and I have a good reading (15 kohm, approx. 60 F). I have 230 VAC on the PC board to the RV coil. If I understand the schematic, If I have 230 VAC on RV Coil, my 4-way valve should be in heat mode, but I am always in cool mode.

I don't know if I have to change the PC board, the RV coil or the 4-way valve ?

Thanks.

Posted on Mar 08, 2010

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If you do not have a windbaffle installed on the outside unit the unit may never come out of defrost in low ambient temperatures. Depending on the outside temperature it might be telling the pcb to stay in defrost to keep the compressor from slugging and being damaged.

Posted on Jan 20, 2010

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1 Answer

Frozen Mitsubishi Mr. Slim?


How low is this unit sitting .Normally a heat pump mini split must be 6 inches and above from ground because that ice need to drain when it goes into defrost and if it's too low from the ground and don't drain properly ice will started to build up and will eventually burst the coil .

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1 Answer

Icing up outside. no heat inside


Isolate unit to defrost out door unit,
Once defrosted run unit ensuring heat from unit inside and fans are running outside,
if fans and compressor are running and there is next to no heat inside coming from indoor unit this is a common sign of a refrigerant shortage in system and this may cause outdoor unit to freeze up

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1 Answer

My Misubishi A/C leaks periodically


clean the filter first then take a shop vac and suck out your condenstate drain line on the outside. Look at the inside coil to see if its dirty if it is clean it.

Sep 06, 2014 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

Mr. Slim aint cool!


Unit short of refrigerant or outside condenser very dirty. Clean outside thoroughly and make sure there is plenty of warmth coming from it when working.

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1 Answer

Have a Mitsubishi Mr Slim and the indicator light is on in Heat mode, but no heat


turn the power off to it by the breaker and let stay off for about 20 minutes if its a lil glitch usually his will resetit if not ur going to have to call a repairman these are not like ur usual units and no easy to work on even for a technician

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some of those units are equipped with a condensat pump you could have a loose connection or a small crack in the line

Jul 08, 2009 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

Inside fan not running in heat mode


i belive these units may have a cold air prevention sensor in them which wont allow fan ops until the coil reaches temp

Mar 04, 2009 | Mitsubishi Mr. Slim MXZ30TN Air...

1 Answer

I need a remote control for a Mitsubishi Mr. Slim, model #MSH15EN


Go to www.mrslim.com and they should be able to give you that info. Please don't forget to give me a Fixya rating. Thanks and good luck

Feb 23, 2009 | Mitsubishi Heating & Cooling

1 Answer

Mitsubishi Mr. Slim M/N MSH15EN


Try calling G A Larson's for technical advice. I think that they handle this product. 499-0866

May 22, 2008 | Mitsubishi Heating & Cooling

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Honeywell VisionPro TH8110R1008 controlling a Carrier FA4ANF018 electric furnace/AC. Heater won't turn on. Honeywell VisionPro TH8110R1008 controlling a Carrier FA4ANF018 electric furnace/AC. As best I can recollect, the sequence of events went like this: Furnace was working normally. Thermostat was set at 70. Turned temperature on thermostat down to 67 and left the apartment. Didn't notice if furnace was running or not at the time, nor if it was running and shut off when I lowered the temp. Came back an hour later. Furnace was running and temp was up to 72 degrees. Thermostat looked normal. No indication of low batteries. Tried turning the system off on the thermostat. Furnace continued to run. Nothing on the thermostat would affect the furnace. Eventually turned off the circuit breaker (for the apartment electrical, not the breaker on the furnace) to stop furnace. Waited. Turned breaker on. Furnace stayed off. Batteries failed in thermostat and screen went dark with barely readable failing battery message. Put in new batteries. Thermostat fired up but still wouldn't control the furnace. Switched to cooling. AC went on. Couldn't turn AC off. Had to turn breaker off again. Turned breaker on. Thermostat displayed "Wait" message when I tried turning on the furnace. Waited half an hour. Wait message disappeared. Still can't turn furnace on. Slid out lithium backup battery and slid back. Thermostat makes appropriate click sounds as if it is turning the furnace on or off, but furnace doesn't respond. Equipment Status screen shows furnace on or off depending on thermostat settings. Set thermostat to System Off. Checked breaker on side of furnace. Was off. Turned on. Turned temp up on thermostat. Thermostat clicked, but furnace did not go on.

Feb 15, 2020 | Carrier Heating & Cooling

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