©2009McQuay
24
Reasons for Malfunction Generating and Solutions
Item Error Code Description Reasons Solutions
1. communication cable is A/B connected opposite
2. communication cable is loose
check communication cable connection
3. communication cable and power cable is crossed
re-do the wiring to avoid power cable and communication cable close;
use shield twisted cable
4. if PCB is power on check PCB
5. if communication distance is too long
use shield twisted cable
short JP7 on PCB
6. Check by monitoring software if there’s communication between
software and thermostat
change a new PCB or remove R44 in the controller.
7. PCB communication port failure change
8. thermostat communication port failure change
1
F6
(controller)
communication
problem
between
thermostat and
PCB
9. Address setting wrong re-set S2 on master unit PCB
check if current overload setting is correct according to the wiring
diagram
compressor
overload
Compressor running current too high, overload protection works
check if compressor resistance is normal
check if current overload setting is correct according to the wiring
diagram
2
ER16
(LED)
fan overload fun running current too high, overload protection works
check if fan resistance is normal
check if pump current overload setting is correct according to the wiring
diagram
3
ER18
(LED)
pump overload pump running current too high, overload protection works
Check if pump resistance is normal
1. pump selection is small change pump
2. strainer is block clean strainer
3. hydraulic system is not air vent enough pump down
4. pressure differential gauge is block maintain or change water pressure differential gauge
5. pressure differential gauge failure change water pressure differential gauge
6. hydraulic system has too much WPD, not balance optimize hydraulic system
4
ER19
(LED)
pressure
differential
gauge failure
7. other components is blocked in hydraulic system check and maintain
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