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Diagnostics
54
8
8.2
WATER PUMP ALARM CODES
Table 8.3
Water pump alarm codes
LED
Meaning
Operational status
Cause
Remedial action
Steady green
light
Pump ON
Pump runs according to
setup
Normal operation
---
Fast blinking
green light
---
Pump in standby
Normal operation
---
Alternately
blinking
between green
and red light
Pump ready but
not running
Pump will start as soon as
the error is cleared
Undervoltage U<160 V or overvoltage U>253 V
Check power supply voltage 195 V
<U<253 V
Air bubbles in water circuit
Disconnect PWM connector until LED
turns into permanent green light, then
reconnect PWM connector
Over temperature of the module
Motor temperature too high
Check fluid temperature and ambient
temperature
Blinking red
light
Pump out of order
Pump blocked
Pump does not restart autonomously
Replace the pump
OFF
No power supply
No voltage on electronics
The unit has never received a service request since
it has been powered electrically, or more than one
hour has elapsed since the last service request was
completed; in these cases the control electronics of
the appliance do not power the pump. It is a normal
operating mode
---
The pump is not connected to the power output
supplied by the control electronics of the appliance
Check cable connection
LED failure
Check if pump is actually running
Failure of electronics
Replace the pump
The control electronics of the appliance do not
activate the power output of the pump although
there is a service request
If the power output of the pump does
not supply voltage, check the cabling of
the electrical panel; if no fault is found,
try replacing the GHP10/GHP11 board