Worcester CDi Combi N.G Service Booklet page 56

RECTIFYING FAULTS
Inadequate hot water outlet temperature (combi boiler)
Check
1. Does pump run?
B Ensure the pump is not in ECO
mode (default after power ON
and after reset).
B Un-plug connector from pump; is
voltage between terminal 1 and
terminal 3 on connector
230 V AC?
2. Compare flow rate from boiler
with showed flow rate in service
function 6.d.
Are they equal?
3. B Switch OFF the appliance.
B Disconnect the boiler power con-
nection.
B Un-plug connector from
Heatronic;
B Reconnect the appliance power
connection.
B Switch ON the appliance.
B Is voltage between terminal 1 and
terminal 3 on Heatronic
230 V AC?
7.5.2 PROGRAMMER FAULTS
Set room temperature not reached (DT10/DT20)
Check
1. Thermostatic valve(s) set too low?
2. Set time periods for channel 1 at the
timer DT10/20 correct?
3. Check the channel 1 at DT10/20
with the service function 6.E. Is the
left digit set to 1?
4. CH flow temperature control on
boiler set too low?
56
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Action
yes: B Try to start pump.
B If not successful, change pump.
no: go to 2
yes: go to 3
no: B Change turbine.
yes: B Switch OFF the appliance.
B Disconnect the boiler power connection.
B Change the lead assembly.
B Reconnect the appliance power connection.
B Switch ON the appliance.
no: B Make a note of the altered service settings (see
table 6 on page 18).
B Switch OFF the appliance.
B Disconnect the boiler power connection.
B Change PCB control board.
B Reconnect the appliance power connection.
B Switch ON the appliance.
B Restore service settings previously noted down.
Action
yes: B Turn up thermostatic valve(s).
go to 2
no: go to 2
yes: go to 3
no: B Correct the time periods for channel 1.
yes: go to 4
no: B Change DT10/20.
yes: B Turn up CH flow temperature control.
go to 5
no: go to 5
8 716 115 748 (2009/09)