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Fault finding
The Fault Finding Chart (Table 6 below) will enable operational faults to be identified and their possible causes rectified. Any work carried out
on the MEGAFLO Eco Solar 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 MEGAFLO Eco Solar Service Division, (p. 40).
Table 6 - Fault Finding Chart
FAULT
N o ho t w ate r flow
W a ter from hot tap s is c o ld
W a ter dis c harg es from
E x pa ns io n V alve
W a ter dis c harg es from t h e
T&P Relief valve intermittently
W a ter dis c harg es from the
T&P Relief valve continually
M ilk y w ater
POSSIBLE CAUSE
1. M a in s w a t e r s u pp ly o ff.
1 . C h ec k and op en s top c oc k .
2. S tra in er bloc k e d.
2 . Turn o ff w a ter s u pp ly . R em ove s tra in er
3. C old W ater C om bination
3 . C h ec k and refit as re qu ired .
V alve inc orrec tly fitted .
1. B A C K U P im m e rs ion h ea te r
1 . C h ec k and s w itc h o n.
no t s w itc hed on.
2 . C h ec k . R e s e t b y pu s h in g bu tto n.
2. B A C K U P im m e rs ion h ea te r
the rm al c ut-ou t h as ope rated .
3 . C h ec k . S e t to a D o m e s tic H ot W a te r
3. IN D IR E C T prog ram m e r s et
to C en tra l H ea tin g on ly .
4 . C h ec k boiler op eration . If fau lt is
4. IN D IR E C T boiler no t
w ork ing .
5 . C h ec k . R e s e t b y pu s h in g bu tto n on c u t-
5. IN D IR E C T th erm a l c ut-ou t
ha s op era te d.
6. IN D IR E C T m oto ris e d va lve
6 . C h ec k w iring a nd/o r p lu m bin g
no t c on ne c ted c orrec tly .
7. Check auxiliary heat source is switched on and
7. SOLAR, Insufficient solar
gain with no auxiliary heating
switched.
1. INTERMITTENTLY
Air volume has reduced within
the expansion vessel
2. C O N TIN U A L LY
a. 3 B a r P r e s s u r e R e d u c i n g
2 a. C hec k pre s s ure from 3 Bar Presssure
Valve not working correctly
2 b. R em o ve E x p ans io n Relief c artrid ge from
b. E x p an s ion V alve s ea t
da m ag ed .
1. Air volume in Megaflo eco has
reduced
2. 8 Bar expansion relief valve
faulty
1. Th erm a l c ontro l failu re
N O TE w ater w ill b e ve ry ho t.
1 . W ate r from a p res s uris e d s y s tem
1. O x y ge na te d w ate r.
REMEDY
a nd c le an (s ee page 28).
(Figure 16, page 23)
p ro gra m m e.
s us pec ted c on s ult bo iler m an ufac turer's
ins tru c tions .
o ut. C h ec k op eration of ind ire c t
therm o s ta t (Figure 16, page 23 ).
c on nec tio ns to m otoris e d valve (s e e F ig 13
and 14).
is controlled to provide heat gain if no solar
output is available
1. See Page 28 for details on how to test and
recharge
Reducing Valve. If grea ter than 3 b ar
rep lac e P re s s ure R ed uc er c artridge .
8 Bar Pressure Relief valve and check seating. If
necessary fit new cartridge
1 . S e e P a g e 3 8 ( O p e r a t i o n a l F a u l t s
s e c tio n for re-c h arging )
2 . C h e c k v a l v e a n d r e p l a c e i f n e c e s s a r y
1 . S w itc h off pow e r to im m e rs ion h ea te r(s )
a nd s hu t d ow n b oile r. D O N O T turn o ff
w ate r s up ply . W h en d is c h arge s top s
c he c k a ll th erm a l c on tro ls , rep lac e if fa ulty .
r e l e a s e s o x y g e n b u b b l e s w h e n
fl o w i n g . T h e m i l k i n e s s w i l l
d i s s a p p e a r a f t e r a s h o r t w h i l e
Unvented Hot Water Cylinder
29
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