View Full Version : McQuay MCK050 error codes???
Radiohead
21-12-2009, 10:05 PM
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
22-12-2009, 06:04 AM
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
22-12-2009, 07:57 AM
Radiohead,
E4 = Compressor overload.
Cycle power off / on. Check all connections, filter, refrigerant charge etc,
Good luck.
Radiohead
23-12-2009, 08:55 AM
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
23-12-2009, 08:58 AM
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
23-12-2009, 10:35 PM
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
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