Question about Mitsubishi MSY-A15NA Split System Air Conditioner

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Mr Slim is dripping condensation into the room. I use this to heat and cool a 500 sq ft finished space over garage. I have been looking for troubleshooting guides but no luck. It is cooling the space, so condenser appears to be functioning. Filter and unit is clean. Any idea on what's going on? Unit is about 18 months old and has worked flawlessly since the start. Any help would be appreciated.

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Hi,

Firstly i would try and establish if the unit is on a gravity drain or a pumped drain.

1. If the drain is gravity it means the condensate water will flow with gravity normally straight through the wall, so check for blockages outside and inside, the unit may look clean but if it hasn't been serviced there may be a build up of dirt in the drain.

So try and locate the outlet of the drain outside (normally by the refrigeration pipework to condenser) and attach a wet hoover to it and make a good seal, this will **** any water/dirt out of the drain line.

2.If its on a pump, a small water pump which collects the condensate in a sump and then pumps it away when a float is activated. (Normally fitted if a gravity drain option is unavailable).
You can check to see if the sump is full and overflowing which is an indication the pump/float has failed and will req replacing by an A/C company. Or the PVC drain line is blocked with dirt.
The pump is either located behind the unit in the casing, or in the white trunk containing the refrigeration pipework

All the best

Posted on Jul 05, 2010

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