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The problem is. When the split system is set to cool , it just blows air not cooled but when set to heat no air blows in the inside unit. Both an electrician and a fridge mechanic installed it. They said that a Mitsubishi specialist can help me with the problem.Mitsubishi, model: MSH-30SV

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

bobotfel
  • 236 Answers

SOURCE: mitshubishi split muh-18nvand inside msh-18nv

-Start the unit.
-Press EMERGENCY OPERATION switch.3-minute time delay works.Test run operation operates for 30 minutes.
-Check voltage to terminal block of outdoor unit.Is there 12V DC between 2-1?
-If voltage is presenet check the wiring, compressor contactor outdoor fan motor and compressor.
-If no voltage check voltage to terminal block of indoor unit.Is there 12V DC between 2-1?
-If if voltage is present re-connect the continuity of indoor and outdoor unit connection.
-If no voltage replace the indoor electronic control P.C.
board.
-But also check the coil thermistor sensor and room air thermistor if this two is out of range it can cause the tripping of out door unit. It has the resistance of 8 to 10 k ohms at 25 deg c temp.
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Posted on Jan 08, 2008

SOURCE: My HVAC split unit is

CHECK THERMOSTAT REVERSING STAYS OPEN

Posted on May 03, 2009

  • 38 Answers

SOURCE: RUUD heat pump system does not cool properly.

With a heat pump system there are always going to be a back up heat strip inside the Air Handler.

If you detect a faint humming in the Condenser call your local service company and ask them to come and replace your capacitor in the condenser. The humming is from the contactor engaging but not being able to start the compressor due to not having the required Microfarads to start it.

Let me know if this helps

Posted on May 08, 2009

  • 11 Answers

SOURCE: split system outside unit won't come on for cooling, only heating

Check your filters, dog hair and lack of maintenance will definitely burden the cooling mode of the Mr Slim units.

Posted on Aug 24, 2009

  • 1 Answer

SOURCE: air not cold...model MSH-18NV no operating manual

Hi FixYa team. After about 2 hours on the internet I managed to find a PDF file of the operating manual for my air con.
Thankyou for your prompt response. I'll be using your services again!

Posted on Jan 14, 2010

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If you detect a faint humming in the Condenser call your local service company and ask them to come and replace your capacitor in the condenser. The humming is from the contactor engaging but not being able to start the compressor due to not having the required Microfarads to start it.

Let me know if this helps

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