The MKIV R32 has a series of codes available through a combination of button presses on the heating controls.
To access the code list: Press "lower fan speed" + "lower temperature" + "ECON".
1) System error
2) Value virtual temperature
3) Value inside temperature at the console
4) Value outside temperature water box
5) Value outside temperature bumper
6) Value blowout temperature feet space
7) Value blowout temperature dashboard
8) Display Check
9) actual value temperature flap
10) rated value temperature flap
11) actual value A/C flap
12) rated value A/C flap
13) actual value feet flap
14) rated value feet flap
15) actual value recirculating air flap
16) rated value recirculating air flap
17) driving speed
18) actual value fan voltage
19) rated value fan voltage
20) actual value on-board voltage
21) Amount of low voltage events
22) switch position high pressure switch
23) amount of volatile high pressure events
24) amount of non-volatile high pressure events
25) A/D Value kick-down
26) A/D Value heater light
27) rpms of the engine
28) rpms of the chiller
29) coding
30) software version
31) software index
32) error counter temperature flap
33) error counter A/C flap
34) error counter feet flap
35) error counter recirculating air flap
36) temperature flap cold
37) temperature flap warm
38) A/C-flap closed
39) A/C flap closed
40) feet flap endstop def
41) feet flap endstop feet
42) recirculating air flap endstop open
43) recirculating air flap endstop closed
44) counter driving cycle