Worcester 350 Combi User Manual

START OF DOMESTIC HOT WATER TEST
NO
Does the STANDBY indicator ill uminate? ~ See s ecti on STANDBY INDICATOR
..
DOES NOT ILLUMINATE .
NO
NO
Set the Operating Switch or programmer ~ Is the STANDBY indicator still ~ FUse Fl has blown.
(if fitted) to WATER . 1\lm a domestic hot illumina t ed?
water tap fu ll y on. Does the DEMAND --r--------
indicator illuminate? YES
YES
NO
Replace the driver boa rd assembly. Is there a live supply on the brown and ~ Rep l ace the Operating Swi tch or
NO I
wh it e pins of terminal X14? programmer (if fitt ed) .
Is there approximately 47V DC on the
blue (bottom) pin of terminal Xl ?
YES
I YES
.,._ Is the wa ter flow ra te at least
3litres/min (0.7 gallons/min)?
YES~'-----.
l
YES
NO
~ In vestigate an d rectify low flow rate .
NO
Is there a li ve supply on the pink pin of .,._ Is t here approxima t ely 47V DC on the ~ Replace the flow switch.
terminal X8 ? brown (top) pin of terminal Xl ?
YES I'-----.
l
Replace the DEMAND indicator . Replace the driver board assembly .
NO NO
NO
Does the hot water pump run ?
~ Does the c entra l heati ng p ump run ~ Is t he re a live supply to the brown pin ~ Replace the driver board assembly.
--y-------- ins t ea d? of te rm inal X 18 ?
YES
Replace the igniti on boa rd
4 ----
NO
I YES
.,._ Is there less than 2V DC on the whi te
pin of termin al X8 ?
I YES
Rep l ace the driver board assembly.
38
I YES
NO
Re m ove the plated sc r ew in the centre ~ Replace the ho t w ater pump .
of the hot wa te r pu mp and tum the
shaft with a fiat bladed screwdriver.
D oe s th e hot water p ump now run?
YES

Worcester 350 Combi Specifications

General

Brand	Worcester
Model	350 Combi
Category	Boiler
Language	English