Worcester ZWBR 7-30 R 30 HE PLUS COMBI Service Booklet page 21

Ad
flashing.
DHW cylinder NTC sensor not detected
Check
1. Is lead for DHW cylinder NTC sensor
correctly routed, i.e. not through
cable clamp?
B Activate menu option Show serv-
2.
ice parameters.
B Select 0.3 Stor. tank
temp.sensor1.
Is a temperature between 0 and
5˚C displayed?
B Unplug DHW cylinder NTC con-
3.
nector from PCB control board.
B Check resistance from connec-
tions 3 to 4 on the cable side.
Does the value match the ones
described in table 7, page 50?
B Unplug NTC sensor from cable in
4.
DHW cylinder.
B Check resistance of NTC sensor.
Does the value match the ones
described in table 7, page 50?
7 181 465 347 (05.01)
Supplied By www.heating spares.co Tel. 0161 620 6677
Action
↓2.
yes:
B Route connecting lead for DHW cylinder tem-
no:
perature sensor as specified in installation
instructions.
Ad? ↓2.
yes: If DHW cylinder sensor connector corroded, dam-
aged or dirty:
B Power OFF the appliance.
B Change NTC sensor.
B Turn ON the appliance.
B Press button
Ad? ↓3.
↓3.
no:
B Make a note of the altered service function set-
yes:
tings (see table 1 on page 7) in order to keep
the altered values.
B Power OFF the appliance.
B Disconnect the boiler electrical connection.
B Change PCB control board.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Restore service settings previously noted down.
↓4.
no:
B Power OFF the appliance.
yes:
B Disconnect the boiler electrical connection.
B Change the NTC sensor connection cable.
B Reconnect the boiler electrical connection.
B Turn ON the appliance.
B Change NTC sensor.
no:
Rectifying faults
Error Ad
.
21