60
7. FAULT FINDING
These fault finding guides are not exhaustive. However, it
is possible to detect and correct many defects by using
the standard fault finding diagrams described in this
chapter, ensure these guides are carried out in the set
order.
7.1 FA
ULT
FI
NDING
GU
IDE
(FLOW-CHARTS)
PRELIMINARY CHECKS
M
AKE SURE THAT:
I
S
T
HE POWER
D
ISPLAY
O
N?
POSTION
OF THE
SELECTOR
NONO
NONO
WINTERWINTERES TAT ESUMMER
NONO
YESYES
YESYES
YESYES
YESYES
YESYES
NONO
NONO
NONO
NONO
NONO
NONO
NONO
YESYES
YESYES
YESYES
TURN ON THE ON/OFF
SWITCH
IS D.H.W.
BEING DRAWN?
IS D.H.W.
BEING DRAWN?
BUILT-IN
ELECTRONIC
ANTI-FROST DEVICE:
Is there a condition for it to be active
(flow temp between 3C & 8C)
ARE THE
TIME CLOCK
AND/OR ROOM
THERMOSTAT
ACTIVATED
A
ECONOMY/
COMFORT
SELECTOR
TEMP.
C.H. < 42°C
Comfort
Comfort
Economy
Economy
1
- There is sufficient water in
the system
2
- The gas is turned on
3
- The electrical supply is
turned on
1 - Check/reset system
pressure
2 - Check/restore gas
supply
3 - Check/replace short-
circuited heating probe
4 - Check/replace siezed
pump
1 - Check/reset the
system pressure
2 - Check/restore
gas supply
3 - Check/replace short-
circuited heating probe
4 - Check/replace
siezed pump
TEMP.
C.H. < 42°C
ECONOMY/
COMFORT
SELECTOR
Y
ESYES
DOES AN ERROR CODE
APPEAR ON THE DISPLAY?
1. Check the fuses
2. Check the power supply to
the control panel
3. Check/replace the
ON/OFF button
4. Check the connection between
the main and display P.C.B.s
s
ee section 3.7
5. Check/replace the
main and display P.C.B.s
BUILT-IN
ELECTRONIC
ANTI-FROST DEVICE:
Is there a condition for it to be active
(flow temp between 3C & 8C)
T
o ensure that the external controls do
not interfere with the fault finding,
disconnect the wires from the terminal
block on the rear of the control panel and
provide a solid link between the
terminals (Section 2.13, page 22).
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