Fault Finding; Error Code Display - Grant Aerona 290 Installation & Operating Instructions Manual

11 FAULT FINDING

11.1 ERROR CODE DISPLAY

When there is a fault with the heat pump, an error code will be
displayed on the touch screen display.
A list of all error codes and corrective actions can be found in
Table 11-1.
Reset the fault when resolved by turning the unit OFF and back
ON.
Fault number Fault name
P01 Water flow
protection
P02 High pressure
protection
P03 Low pressure
protection
P04 Condenser
temperature
overheat pro-
tection
P05 Discharge
temperature
protection
P08 Middle pressure
protection
P11 DC fan 1 failure
P12 DC fan 2 failure
P13 4-way valve
fault
Page 46
Failure analysis
1.
Lack of water in water system
2.
Water flow switch is faulty
3.
Water system is blocked
1.
Water flow is low
2.
High pressure switch is faulty
3.
Refrigerant system is blocked
4.
Electric expansion valve is
locked
(HP1, Occurring during operation)
1.
Lack of refrigerant
2.
Refrigerant system is blocked
3.
The heat pump is not running
in regular operating conditions
1.
Airflow of outdoor fan is
insufficient
2.
Condenser is too dirty
3.
The temperature sensor (T3)
is faulty
1.
Lack of refrigerant
2.
Discharge temperature sensor
is faulty
1.
Middle pressure switch not
connected correctly
2.
The refrigerant PCB is faulty
1.
The fan is faulty or stuck
2.
The refrigerant PCB is faulty
(or drive PCB on 15.5 kW
models)
1.
Flow and return water
temperature sensors are
connected in reverse
2.
4-way valve is faulty
3.
Hydraulic PCB is faulty
! NOTE !
Error codes displayed may be due to incorrect dip switch
settings on the heat pump PCB.
Refer to Section 10-10 for dip switch settings and check
these are correctly set for the heat pump model and
installed system.
Diagnosis method
1.
Check system water pressure
2.
Check whether the water flow
switch is damaged/faulty
3.
Check if filter is blocked
1.
Check system water pressure
and pump is operational
2.
Check high pressure switch
connection/operation
3.
Check whether the refrigerant
system is blocked
4.
Check whether there is electric
expansion valve reset sound
when the unit is in standby,
and power is ON or OFF
1.
Check for leak in refrigerant
circuit
2.
Check whether the filter in
refrigerant circuit is blocked
3.
Check whether the outdoor
ambient and inlet water
temperature is normal
1.
Check whether there is any
obstacle which is preventing
the airflow
2.
Condenser is too dirty
3.
Check whether the condenser
pipe temperature sensor (T3)
seems in normal condition
1.
Check for leak in refrigerant
circuit
2.
Check whether the discharge
temperature sensor (TP)
seems in normal condition
1.
Check connections on sensor
and refrigerant PCB
2.
Check refrigerant PCB
1.
Check whether the fan is stuck
or obstructed
2.
Check refrigerant PCB (or
drive PCB on 15.5 kW models)
1.
Check whether the flow and
return temperature sensors are
connected in reverse
2.
Check whether action of 4-way
valve is correct
3.
Check flow and return
temperatures indicated the
hydraulic PCB
Solution
1.
Fill system to correct pressure
2.
Change the water flow switch
3.
Clean or change the filter
1.
Fill system to correct pressure
and check pump operation
2.
Change high pressure switch
3.
Change the filter of the
refrigerant system
4.
Change the Electric expansion
valve
1.
Repair the leak
2.
Change the filter of refrigerant
circuit
3.
If the ambient temperature and
water temperature is too high
or low, the unit will stop
1.
Clean the grille and evaporator
2.
Clean the condenser
3.
Replace the temperature
sensor
1.
Repair the leak
2.
Replace the temperature
sensor
1.
Replace the middle pressure
switch
2.
Replace refrigerant PCB
1.
Remove any obstructions or
replace fan if faulty
2.
Replace the refrigerant PCB
(or drive PCB on 15.5 kW
models)
1.
Connect sensors correctly,
replace sensors if fault remains
2.
Switch repeatedly to check
operation is correct. If not,
replace
3.
If flow and return temperature
are still incorrect, replace
hydraulic PCB
Section 11: Fault finding