Diagnostics
Installation, use and maintenance manual – K18 Hybrigas
57
8
8.3
WATER PUMP ALARM CODES OF HEAT
PUMP MODULE
Table 8.5
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 stand-by
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
Module overtemperature 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 anomaly is
found, try replacing the GHP10 board