G Characteristic Values For The Internal Temperature Sensors, Hydraulic Circuit - Vaillant VWZ AI Operating Instructions Manual

Appendix
Code Meaning
F.823 Hot gas temperature switch open
F.825 Sensor fault: Capac. inlet temp.
F.1117 Compressor: Phase failure
F.9998 Connection fault: Heat pump
G Characteristic values for the internal temperature sensors, hydraulic circuit
Sensors: TT620 TT650
Temperature (°C)
0
5
10
15
20
25
30
35
40
45
50
55
60
65
70
75
80
85
34
Cause
–
The hot gas thermostat shuts down
the heat pump if the temperature
in the refrigerant circuit is too high.
Following a waiting period, the heat
pump attempts to start once more.
After three failed start attempts
in succession, a fault message is
displayed.
–
Max. refrigerant circuit temperature:
110 °C
–
Waiting period: 5 mins (after it first
occurs)
–
Waiting period: 30 mins (after it
occurs a second time and any other
time after that)
–
The fault counter is reset if both of
the following conditions are met:
–
Heat requirement without switch-
ing off prematurely
–
60 mins uninterrupted operation
–
Refrigerant circuit temperature
sensor (vapour-forming) not con-
nected or the sensor input has short-
circuited
–
Defective fuse
–
Incorrect electrical connections
–
Mains voltage too low
–
Compressor/low tariff power supply
not connected
–
Blocked by energy supply company
for over three hours
–
eBUS cable not connected or con-
nected incorrectly
–
Outdoor unit without supply voltage
Resistance (ohms)
33400
25902
20247
15950
12657
10115
8138
6589
5367
4398
3624
3002
2500
2092
1759
1486
1260
1074
Installation instructions Heat pump control interface module 0020291573_00
Remedy
–
Check the EEV
–
Replace the dirt filter in the refrigera-
tion circuit, if required
–
Check and, if required, replace the
sensor and cable
–
Check the fuse
–
Checking the electrical connections
–
Check the voltage at the heat pump
electrical connection
–
Reduce energy supply company
anti-cycling time to under three hours
–
Check the connection pipes between
the power supply PCB and control
PCB on the indoor and outdoor unit