Grant Aerona 290 Installation & Operating Instructions Manual page 47

Fault number Fault name
P14 Refrigerant
leakage fault
P21 Abnormal
operation of DC
pump
P25 Outlet pressure
sensor failure
E02 Discharge
temperature
sensor failure
(TP)
E03 Coil
temperature
sensor failure
(T3)
E04 Ambient
temperature
sensor failure
(T4)
E05 Liquid pipe
temperature
sensor failure
(T5)
E06 Return air
temperature
sensor failure
(TH)
E07 Water tank
temperature
sensor failure
(TW)
E08 Outlet water
temperature
sensor failure
(TA)
E09 Outlet water
temperature
sensor failure
(TB)
E10 Communication
failure between
hydraulic PCB
and refrigerant
PCB
E13 Discharge
pressure sensor
fault
E14 Low pressure
sensor LPS
failure
Section 11: Fault finding
Failure analysis
1.
Leak in refrigerant circuit
2.
Refrigerant leakage sensor
failure
3.
Hydraulic PCB is faulty
1.
The water pump is faulty or
stuck
2.
The system lacks water or is
blocked
3.
Faulty connection between
water pump and hydraulic PCB
4.
The hydraulic PCB is faulty
1.
Pressure sensor incorrectly
connected
2.
Sensor failure
3.
The hydraulic PCB is faulty
1.
Sensor incorrectly connected
2.
Sensor failure
3.
The hydraulic PCB is faulty
1.
Communication cable
incorrectly connected
2.
The main hydraulic PCB is
faulty
3.
The refrigerant PCB is faulty
1.
Sensor connection incorrectly
connected
2.
Sensor failure
3.
The refrigerant PCB is faulty
Diagnosis method
1.
Check whether there is
leakage in refrigerant circuit
2.
Check whether refrigerant
leakage sensor is normal
3.
Check whether Hydraulic PCB
is faulty
1.
Check operation of water
pump
2.
Check system water pressure,
whether system is blocked
(check filter) or valve(s) are
closed
3.
Check connections between
water pump and hydraulic PCB
4.
Check the hydraulic PCB
1.
Check correct connection of
sensor
2.
Use a multimeter to check if
sensor has short circuit or is
faulty
3.
Check the hydraulic PCB
1.
Check correct connection of
sensor
2.
Use a multimeter to check
sensor
3.
Check the hydraulic PCB
1.
Check correct connection of
communication cable
2.
Check the hydraulic PCB
3.
Check the refrigerant PCB
1.
Check correct connection of
sensor
2.
Use a multimeter to check if
sensor has short circuit or is
faulty
3.
Check the refrigerant PCB
Solution
1.
Repair leak in refrigerant circuit
2.
Replace refrigerant leakage
sensor
3.
Replace Hydraulic PCB
1.
Replace water pump if faulty
2.
Refill with water, remove
blockage (clean filter) and
open any closed valves
3.
Correctly make connections on
water pump and hydraulic PCB
4.
Replace the hydraulic PCB if
faulty
1.
Connect sensor correctly
2.
Replace sensor if faulty
3.
Replace the hydraulic PCB if
faulty
1.
Connect sensor correctly
2.
Replace sensor if faulty
3.
Replace the hydraulic PCB if
faulty
1.
Replace or repair the
communication cable
2.
Replace the hydraulic PCB if
faulty
3.
Replace the refrigerant PCB
if faulty
1.
Connect sensor correctly
2.
Replace sensor if faulty
3.
Replace the refrigerant PCB
if faulty
Page 47