Troubleshooting Flow Chart - McQuay MDS Series Service Manual

6.6 Troubleshooting Flow Chart

Indoor/outdoor sensor failure
Error code: Decorative Error code #2 and #4, E1 to EC, F1 to F5, 11 to 1C (For MC301), E0 to E6 (For MDOM
PCB), ER64 to ER75 (For MDS-M PCB)
Turn off the unit
Is the sensor correctly
connected?
Is the sensor resistance
characteristics normal?
Refer Appendix 7.5
Replace PCB
Remark:
OD : Outdoor
ID : Indoor
Spec : Specification
PCB : Control Module/Control Board
Service Manual SM-MDS_(ii)
NO
YES
NO
YES
Connect correctly and operate
again
Replace sensor
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