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Rectifying faults
45
Excessive fluctuations in room temperature (integrated text display)
Check Action
1. TR2 without room override:
B Periodic effect of external heat on
room, e.g. from sunshine, lighting,
TV, separate stove, fire, etc.
yes: B Switch on room override.
↓2.
no: ↓2.
2. Room override has insufficient
priority
yes: B Increase room override priority (not text display).
↓3.
no: ↓3.
3. Bad choice of location for program-
mer, e.g. outside wall, near window,
in draught, on hollow wall, etc.
B Select better installation location.
-or-
B Fit external room thermostat.
Room temperature too high in Economy mode
Check Action
Building retains heat well yes: B Set economy temperature lower
or
B Set to Frost Protection instead of Economy
or
B Set start time for Frost protection/Economy
earlier.
Incorrect or no modulation
Check Action
Programmer incorrectly wired B Power OFF the appliance.
B Check wiring against wiring diagram and correct
as necessary.
B Turn ON the appliance.
No programmer display or programmer display does not react
Check Action
Very brief power loss B Power OFF the appliance.
Wait approx. 1 minute, then:
B Turn ON the appliance.
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