IVT X Series - Electric Element Fault; Heat Pump Now Working at Max. Permitted Temp. (T8); Electric Element Now Working at Max; Permitted Temp. (T8)

Rectify interference
6 720 643 196 (2010/02)
18
2.3.12 Electric element fault
2.3.13 Heat pump now working at max. permitted
temp. (T8)
2.3.14 Electric element now working at max. permit-
ted temp. (T8)
Description: Electric element fault Reset on the overheat protection and must be acknowledged in the display.
Check Action
1. B Check the supply to the electrical
additional heat (measured on the AHB
circuit board terminals).
Is it OK?
yes: Æ 2
no: B Check the wiring in the heat pump.
2. B Try to reset the overheat protection
again.
Was it successful?
yes: Does the error message recur? Æ 3
no: Æ 3
3. Overheat protection electric element
defective.
B Replace the AHB board.
Tab. 12
6 720 643 196-10.1I
Description: Value on T8 has exceeded 65 °C.
See fault tracing tree High forward flow
T1. (Æ Chapter 2.3.5)
Tab. 13
6 720 643 196-11.1I
Description: Value on T8 has exceeded 75 °C.
See fault tracing tree High forward flow
T1. (Æ Chapter 2.3.5)
(Can only occur during additional heat operation).
Tab. 14
6 720 643 196-12.1I