Excessive Fluctuations In Room Temperature; Room Temperature Too High In Economy Mode; Incorrect Or No Modulation; No Programmer Display Or Programmer Display Does Not React - Worcester ZWBR 7-30 R 30 HE PLUS COMBI Service Booklet

Excessive fluctuations in room temperature (integrated text display)
Check
1. TR2 without room override:
B Periodic effect of external heat on
room, e.g. from sunshine, lighting,
TV, separate stove, fire, etc.
2. Room override has insufficient
priority
3. Bad choice of location for program-
mer, e.g. outside wall, near window,
in draught, on hollow wall, etc.

Room temperature too high in Economy mode

Check
Building retains heat well

Incorrect or no modulation

Check
Programmer incorrectly wired

No programmer display or programmer display does not react

Check
Very brief power loss
7 181 465 347 (05.01)
Supplied By www.heating spares.co Tel. 0161 620 6677
Action
B Switch on room override.
yes:
↓2.
↓2.
no:
B Increase room override priority (not text display).
yes:
↓3.
↓3.
no:
B Select better installation location.
-or-
B Fit external room thermostat.
Action
B Set economy temperature lower
yes:
or
B Set to Frost Protection instead of Economy
or
B Set start time for Frost protection/Economy
earlier.
Action
B Power OFF the appliance.
B Check wiring against wiring diagram and correct
as necessary.
B Turn ON the appliance.
Action
B Power OFF the appliance.
Wait approx. 1 minute, then:
B Turn ON the appliance.
Rectifying faults
45