Worcester GREENSTAR 25Si Instruction Manual page 65

If in the unlikely event the boiler does not
give complete satisfaction, before calling
for a service engineer, the installer should
check the following:-
No Central Heating
Is the room stat correctly wired up at the boiler and the
room thermostat?
Refit the link between Ls and L
tions correctly, the problem may be with the external thermostat or the
wiring of it.
No Hot water
Are the domestic hot and cold pipes crossed?
Check 1: If the boiler has a built in filling loop.
1. Close the 15mm cold inlet bulkhead valve with a screwdriver.
2. Open a hot tap (no water should flow from the open tap).
3. Insert filling key into filling link.
4. Open valve to fill system.
If it is still possible to re-pressurise the sealed system, the domestic
hot and cold pipes are crossed.
Check 2: If the boiler has an external filling loop fitted to the
cold main adjacent to the boiler.
1. Close the 15mm cold inlet bulkhead valve with a screwdriver.
2. Open a hot tap (no water should flow from the open tap).
3. Connect flexible hose across filling link.
4. Open valve to fill system.
If no water enters the sealed system, the domestic hot and cold pipes
are crossed.
Burner lights then goes out in DHW or CH
mode
Does the boiler run normally with the front cover off and
then fail when the cover is put back on?
If yes there is likely to be a flue problem - either the air inlet is blocked or the
inner flue is leaking flue gases into the air inlet.
General checks
1. Is all the air bled from the gas supply?
2. Is all the air bled from the primary water system?
3. Is there 230v ac across the boiler live and neutral terminals?
(L & N on ST10)
4. Is the polarity correct?
5. Is the incoming gas pressure at least 18mbar with the boiler at maximum
output?
Dedicated to heating comfort
Worcester, Bosch Group
Cotswold Way, Warndon, Worcester WR4 9SW.
Tel. 01905 754624 Fax. 01905 754619
Worcester, Bosch Group is a brand name of Bosch Thermotechnology Ltd.
www.worcester-bosch.co.uk
8 716 115 165a (06/2008)
on terminal block ST 10. If the boiler func-
R
Pack Number
CONTACT INFORMATION
WORCESTER, BOSCH GROUP:
TECHNICAL: 08705 266241
SERVICE: 08457 256206
SPARES: 01905 752571
LITERATURE: 01905 752556
TRAINING: 01905 752526
SALES: 01905 752640
WEBSITE: www.worcester-bosch.co.uk