D5 Contact Humidistat - Viessmann VITOTRONIC 200 Service Instructions Manual

Troubleshooting
Message overview
Cause

D5 Contact humidistat

Compressor stops.
Cause
Contact humidistat has responded.
100
(cont.)
Measure
Reduce set cylinder temperature ("Set DHW temper-
■
ature 6000", "Set DHW temperature 2 600C") by 2
to 3 K.
Check high pressure sensor at the following connec-
■
tions of the outdoor unit:
– Vitocal 100-S/111-S:
"H_PRESS" connection on the main PCB: See
"Main PCB [7] / [7-1]".
–
Vitocal 200-A/200-S/222-A/222-S:
Connection J10 on EEV PCB: See "EEV PCB
[4-3] / [4-4]".
– Vitocal 200-A, type AWCI-AC 201.A:
Connection J3 on the EEV PCB: See "EEV PCB
[2]".
–
Vitocal 222-G/333-G:
Connection J10 on EEV PCB: See "EEV PCB
[4-6] / [4-7]".
– Vitocal 300-A, type AWO-AC 301.B:
Connection J10 on the EEV PCB: See "EEV PCB
[4]".
– Vitocal 300-A, type AWO 302.B:
Connection J5 on the controller PCB: See "Control-
ler PCB [6]".
Note
In rare cases, e.g. during DHW heating, a high pres-
sure fault can occur.
If this occurs several times in succession, check the
heat pump and parameter settings of the refrigerant cir-
cuit.
Measure
Check 24 V contact humidistat at plug F11: See "Con-
–
troller and sensor PCB".
0 V Fault
24 V No fault
–
Note
If the 230 V~ contact humidistat at X3.8/X3.9 is used for
cooling, check the jumper at plug F11.