10
MQH 11/08
• If an alarm is occurred, the alarm code is displayed,
but after 30’, even if the alarm is still active, the display
shows again the mode but “Alarm” message is display-
ed for 2’ every 10’ when an alarm is active.
When we enter in Alarm list, the first alarm code dis-
played is the last occurred.
ALARM SUMMARY
Fault as on display
Fault description
ADC
ADC error
CPF
CP transducer failure, out of range
EPF
EP transducer failure, out of range
REF
Refrigerant leak- low pressures
CPnc
CP transducer failure, no change error
EPnc
EP transducer failure, no change error
CFC1
CP and EP no change, compressor not operating (burn out or phase change)
EWTH
EWT entering water temperature sensor short circuited
EWTL
EWT entering water temperature sensor short disconnected
LWTH
LWT entering water temperature sensor short circuited
LWTL
LWT entering water temperature sensor short disconnected
OATH
OAT outdoor air temperature sensor short circuited
OATL
OAT outdoor air temperature sensor short disconnected
OCTH
OCT coil temperature sensor short circuited
OCTL
OCT coil temperature sensor short disconnected
HP
High pressure protection, automatic reset for first three times
HPC
High pressure cut-out
LP
Low pressure limit, unit cut out
LO
Leaving water temperature below allowed limits
HI
EWT is too high
FS
Flow switch opens, low water flow
CF1
CF1 input open, compressor 1 overload
OF1
OF1 input open, outdoor fan overload
PF
PF input open, pump internal overload
LOu
Low water volume
ConF
Not allowed configuration
2.4
CHECKING THE OPERATION
Check the following:
• The temperature of the water entering the evaporator.
• The temperature of the water leaving the evaporator.
• The level of the water flow rate in the compressor and
in case of stabilized operation.
• The fan's current absorption.
