Technical data

14
8.3 FAULT FINDING
The Fault Finding chart below will enable operational
faults to be identied and their possible causes rectied.
Any work carried out on the Premier Plus unvented water
heater and its associated controls MUST be carried out by
a competent installer for unvented water heating systems.
In case of doubt contact the Santon Service Department
(see contact details at foot of page 16).
DO NOT TAMPER WITH ANY OF THE
SAFETY VALVES OR CONTROLS SUPPLIED
WITH THE PREMIER PLUS AS THIS WILL
INVALIDATE ANY GUARANTEE
TABLE 5 Fault Finding Chart
WARNING
F A U L T P O SSIB L E C AU S E R E M E D Y
N o hot wate r flow 1 . M ains s up ply o ff 1. C hec k a nd open s top c o c k
2. S trainer bloc k ed 2. Turn off wate r s upply .
R em ove s tra in er and c lean (s ee
S ec tion 7.3)
3. C old W a ter C om bination
V alve inc orrec t ly fitted
3. C hec k a nd refit as req uired
W ater fro m hot taps is
c old
1. D IR E CT immers ion
he ate r n ot s w itc h ed on
1. C hec k a nd s w itc h on
2. D IR E CT immers ion
he ate r t herm al c ut-o ut has
op erated
2. C hec k .
R es et by p us hing
butto n.
3. IN D IRE C T pro gra mmer
s et to Central H eating only
3. C hec k . S et to a D om es tic
H ot W ater programme
4. IN D IRE C T boiler not
w ork ing
4. C hec k b oiler op era tion. If fault
is s us pec t ed c ons ult boiler
m anu fac ture r's ins t ruc tions
5. IN D IRE C T therm al c u t-
ou t has opera ted
5. C hec k . Re s e t by pus hing
button on c ut -out. C heck
op eration o f indire c t therm os ta t
6. IN D IRE C T m o toris e d
valve not c onnec ted
c orre c t ly
6. C hec k w iring an d/o r p lum b ing
c onn ec tions to m ot oris ed va lve
(s ee F ig. 7)
W ater dis c h arg es 1. IN TE R M ITTE NTLY
from E x p ans ion V alve E x pa ns io n V e s s el c ha rge
pres s ure has reduc ed be lo w
3.5ba r
1. S ee S e c tion 7.5 for re-
c harging proc edure
2. C O N TIN UA L LY
a. C old W a ter C om bination
V alve P re s s ure R educ er not
w ork ing c o rrec tly
a. C hec k p re s s ure fro m Co ld
W ater Com bination V a lve. If
greater t han 3. 5bar replac e
P re ssure R educ e
r c art ridge
b. E x pans ion V alve s eat
da m aged.
b. R em ove E x pans ion V alve
c artrid ge. C he ck c ondition of
s eat . If nec e s s ary fit new
E x pans ion V alve c artridge.
W ater dis c h arg es from
T& P R elief V alve
1. Therm al c ontrol failu re
N O TE w ater will be very h ot
1. S w it c h off pow er to
imme rs io n h eater(s ) and s hut
do wn boiler. D O N O T tu rn off
w ate r s upply . W hen disch arg e
s top s c h ec k all t herm al
c ont rols , replac e if faulty .
"M ilky" w ater O x y ge
nated w at er W ater fro m a p ressuris ed
s y s tem re le as es o x y gen
bu bbles w hen flo wing. The
m ilk iness will dis appear afte r a
s hort w hile.