McQuay MDS 100B

Service Manual SM-MDS_(ii) 87
Emergency Run
Error Code: EF, 1F (For MC301), ER60 (For MDS-M PCB)
Replace outdoor PCB and restart the system
Check the refrigerant
charge. Is it within
specification?
NO
Replace sensor and restart the
system
YES
NO
YES
Find the root cause for
communication error and solve it.
Restart the unit
Restart the unit
Recharge refrigerant
accordingly and restart the
system
Is there any communication
error captured by the system?
Is the resistance for
sensor TH12 normal?
Refer Appendix 7.5
6
YES
NO