505
REVO-E Heat pump 5 Troubleshooting
Actions
– Measured values on sensor NOK => replace sensor
– Measured values on cable harness (SC620 side)
NOK => inspects pin / replace cable harness
– Measured values on cable harness (SC620 side) OK
=> replace SC620
F08 Temperature of air duct / outlet temperature too
low (T<= -40°C)
System behavior
– Limited heating functionality
Necessary inspections
– Sensor values using DCT
– Sensor resistance on the sensor / to the SC620 plug
(SC620 not connected) according to wiring plan
10kOhm 12.5kOhm 15.7kOhm
25°C 20°C 15°C
– Voltage present on sensor when SC620 and sensor
plug connected
1.36V 1.5V 1.7V
25°C 20°C 15°C
Actions
– Measured values on sensor NOK => replace sensor
– Measured values on cable harness (SC620 side)
NOK => inspects pin / replace cable harness
– Measured values on cable harness (SC620 side) OK
=> replace SC620
F09 Temperature of recirculated air / passenger cabin
too high (T≥ 105°C)
System behavior
– Limited heating functionality
– Limited cooling functionality
Necessary inspections
– Sensor values using DCT
– Sensor resistance on the sensor / to the SC620 plug
(SC620 not connected) according to wiring plan
10kOhm 12.5kOhm 15.7kOhm
25°C 20°C 15°C
– Voltage present on sensor (SC620 / sensor plug con-
nected)
1.36V 1.5V 1.7V
25°C 20°C 15°C
Actions
– Measured values on sensor NOK => replace sensor
– Measured values on SC620 plug NOK => inspect pins
/ replace cable harness
– Measured values on cable harness SC620 side OK
=> replace SC620
F10 Temperature of recirculated air / passenger cabin
too low (T<= -40°C)
System behavior
– Limited cooling functionality
– System in Cooling Mode
Necessary inspections
– Sensor values using DCT
– Sensor resistance on the sensor / to the SC620 plug
(SC620 not connected) according to wiring plan
10kOhm 12.5kOhm 15.7kOhm
25°C 20°C 15°C
– Voltage present on sensor (SC620 / sensor plug con-
nected)
1.36V 1.5V 1.7V
25°C 20°C 15°C
Actions
– Measured values on sensor NOK => replace sensor
– Measured values on SC620 plug NOK => inspect pins
/ replace cable harness
– Measured values on cable harness SC620 side OK
=> replace SC620
F11 Sensor value high pressure implausible high
(evaluation of sensor signal)
(measured value Pabs > 26bar)
System behavior
– Error occurs after multiple switching of the high-pres-
sure safety switch
– only in combination with F18
In Cooling Mode:
– default value high pressure 20bar
– axial fans maximum speed
In Heat Pump Mode:
– radial blowers maximum speed
– compressor minimum speed
Necessary inspections
– Sensor values using DCT
– Check pressure with pressure gauge and calibrate
with sensor values
(Attention: sensor values are absolute values)
– Sensor resistance 5.4kOhm on the sensor / to the
SC620 plug (SC620 not connected) according to
wiring plan when compressor has not been function-
ing for long period of time
– Voltage present on sensor (SC620 / sensor plug con-
nected) when system running
~7.4bar ~6.4bar
1.36V 1.5V
When compressor has been off for a longer time
1.7V at 15°C
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