Table of Contents
Advertisement
15.0
FAULT FINDING
Fault Finding Solutions Sections A to E
A
I
Is there 230V at:
I
1.
NO
Check electrical supply
Q
neon
INO
Illuminated
I
Replace PCB I..
2. I Main terminal fuse I YES
..
Replace
fuse
Replace fan 1
Main terminals Land N
3.
Selector terminals a & b
and a & 3. PCB - M1
connector terminals 9 & 10
NO
Check wiring
Replace selector
B
I
Is there 230V at:
I
1.
I
Pump
I---i
If pump jammed, release
~I
Replace pump
I
2.
I
PCB - M1 connector terminals 8 & 15
I
NO
.
I
Replace PCB
YES
c
1.
I
CH system pressure 0.5 to 1.5 bar
~
NO
"I
Re-pressurisesystem
I
I
Open the automatic air vent
I
2.
NO
Check the tap of the automatic
air vent is opened
3.
Primary flow valve diaphragm damaged
NO
YES
Replace diaphragm
Flow valve rod obstructed
D
1.
Continuity across flow
microswitch and PCB M2
connector terminals 3 & 4
NO
I
Replace
microswitch
I
2.
Primary temperature sensor faulty.
IYE~
Cold resistance approx. 11K ohms
I
Replace sensor
I
(resistance reduces with increase in temp.)
3.
Fan connections correct at fan.
PCB - M5 connector, is 230V
across terminals 28 & 29
YES
,YES
'I
Fan jammed or faulty winding
INO
'I
Replace PCB I
4
Advertisement
Table of Contents
