McQuay MCK050 error codes???

[Radiohead]

Hey all,
Hope someone can come up with an answer,
I have a McQuay MCK050 Cassette on R407c
with there SLM3 remote control showing an
E4 Error during the heating cycle,
Any ideas??

[baycuclaudyu]

Look inside the filter probably there is show alarm codes. What is the outside temperature ?Maybe cant make the defrost cycle or is too cold outside.

[MQFS OZ]

Radiohead,

E4 = Compressor overload.

Cycle power off / on. Check all connections, filter, refrigerant charge etc,

Good luck.

[Radiohead]

Hey Baycuclaudyu,

Outside temps are going from +3 to -2c
the system fault seems to effect the unit after it has been on for some time,
so could be a defrost problem,
Can the defrost time \ temp limit be extended to help clear a build up on the outdoor unit??

[Radiohead]

Hi MQFS OZ,

Thanks for the reply, going to run through a few of these on site later,
will let ya know how it goes.

[MQFS OZ]

Radiohead,

Also check all sensors for shorts and lose connections. If the unit has a phase protection board with a discharge temp sensor the system may have faulted on high discharge temp.

Regards MQFS OZ