Worcester CDi Combi N.G Service Booklet page 70

TROUBLESHOOTING - TD 200
Complaint Cause
Required temperature Thermostat valve(s) in the control room set
not reached to low
Flow temperature controller on the heating
appliance set too low
Air lock in the heating system
Required room Installation location of the TD 200 not
temperature is greatly suitable, e.g. outer wall, proximity to
exceeded window, draught, ...
Excessive room Temporary effect of heat from other
temperature sources on the room, e.g. from sunshine,
fluctuations room lighting, TV, fireplace etc.
Temperature rise Time of day incorrectly set
instead of fall
Room temperature Building has high degree of heat storage
too high in Economy
mode
Incorrect or no Bus connection defective for the devices
control using the bus
Only Automatic mode Operating switch defective
can be set
Tab. 37
70
Supplied By www.heating spares.co Tel. 0161 620 6677
Remedy
Fully open the thermostat valve(s)
or replace them with manual valve(s).
Set flow temperature controller higher.
Vent radiator and heating system.
Choose a better installation location for TD 200
(see Installation Instructions of the TD 200).
Choose a better installation location for TD 200
(see Installation Instructions of the TD 200).
Check setting.
Select Economy mode earlier.
Check the bus connection, if necessary, rectify
according to the connection diagram.
Replace the TD200
8 716 115 748 (2009/09)