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Wall unit leaking drain is clear

\015 Any idea where the leak could be? Model is MS-18/MSN-18N.\015\012Service guy serviced unit and after the service the unit began to leak, he will not return calls and I have removed the cowl that is the drain and removed fluff and debris but it still leaks\015

Answers :

Sorry, am not familiar with the model number. But offer advise as follows: If it is a midwall split type.
\015\0121) Make sure the filters are clean as you have already done.
\015\0122) Locate drainpipe on outside of building and either using a mechanical blower or your mouth, blow into this pipe to dislodge any sludge buildup at the drainpan outlet. Note, this may block up again and will have to be done until all sludge passes through.
\015\0123) Extreme possibility is that the drainpipe has disconnected from the drainpan.
\015\0124) Running the unit at too low setpoint temperature during periods of high humidity can cause evaporator freezeup to the extent that the ice overlaps drainpan edge and leaks into the room.
\015\012
\015\012Or if this is a window or box type, same applies, clean filter, on the outside there is a hole where the condensate water should drip to the outside, make sure it is clear. Check if the fins on the evaporator, behind the filter and cowl, are clean. If not this could cause a restriction of airflow and result in excessive ice buildup. The only way to properly clean the finplates is with an evaporator coil cleaner specifically made to foam the dirt out.
\015\012Hope this helps, rate me.

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