27
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 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 Service Division, (p. 40).
Table 6 - Fault Finding Chart
YDEMERESUAC
ELBISSOPTLUAF
1. M ains water s u pply o ff.
2. S tra iner bloc k e d.
and c lean (s e e p.28).
3. C o ld Water C om binatio n
V alve inc orrec t ly fitted.
3. C h e c k and re fit as re q u ired .
1. BACK UP imme rs ion heater
not s w it c hed on.
1. C h e c k and s witc h o n .
2. BACK UP imme rs ion heater
therm al c ut-ou t h a s opera ted .
2. C h e c k . R es e t b y pus hing button.
(Figure 16, p.23)
3. IN D IR E CT programme r s et
to central h e a t ing on ly .
3. C h e c k . S et to a dom es tic hot water
programme.
4. IN D IR E CT boiler not
w
ork ing.
4. C h e c k boiler o p e ration. If fau lt is
s us pec ted c on s ult boiler m anufa c tu rer's
ins tru c tions .
5. IN D IR E CT therm al c ut -o u t
has op e ra ted.
5. C h e c k . R es e t b y pus hing button on c u t-
out. C h e c k operation of in d ire c t therm os t at
(Figure 16, p.23 ).
6. IN D IR E CT m otoris ed valve
not c o n n e c ted c orre c tly .
6. C h e c k wiring and/or plu m bing
c on nec tions to m otoris ed valve (s ee F igures
13 & 14, p.21).
1. IN TE R M ITTE N TL Y
Air Volume in MEGAFLO
Eco has reduced.
1. S ee p .38 (operational faults
s e c tion for re-c h a rg ing)
2. C O NTIN UA LLY
2a.
C hec k p res s u re from 3 bar Pressure
Reducing Valve. If greater than 3 b ar
repla c e Pre s s ure Reduc e r c artridge .
b. E x p a n s ion valve s eat
dam aged.
W ater dis c harges from the
Temperature and Pressure Relief
Valve continually
1. Therm al c ontro l failu re
N O TE water w ill be very hot.
1. S witc h o ff powe r t o immers ion heater(s )
and s h u t dow n b oile r. D O N O T turn off
w a t e r s upply . W h e n disch a rg e s top s
c he ck a ll therm al c o n trols , re p lac e if faulty .
M ilk y w ater
1. O x y g e nated w a t e r.
rele a s es ox y ge n bubble s w h e n flo w in g. The
m
ilk iness will dis appe ar after a s hort w hile .
No h o t w ate r flo w
W ater from hot taps is c o ld
W ater dis c harges from
8bar Pressure Relief Valve
1. C h e c k and o p en s t op c oc k .
2. Turn o ff w ater s up p ly . R em ove s tra iner
1. W ater from a pres s uris ed s y s tem
2b. R e m o ve Pressure Relief c art ridge from
8 bar pressure Relief Valve and check seating. If
necessary fit new cartridge.
a. 3 bar Pressure Reducing
Valve not working correctly
1. Air volume in MEGAFLO Eco has
reduced
1. S ee p .38 ‘Operational Faults’
(for re-c h argin g )
W ater dis c harges from the
Temperature and Pressure
Relief valve intermittently
2. 8 bar Pressure Relief Valve
faulty
2. Check valve and replace if necessary
MAINTENANCE AND
SERVICING (3)
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