Table des Matières
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Fault Finding Solutions Sections A to K
A
Is there 120V at:
1.
Main terminals L and N
2.
Main terminal fuse
3.
Selector terminals a & b and
a & 3. PCB - A4 connector
terminals 4 & 5
B
Is there 120V at:
NO
1.
Pump
2.
PCB - A4 connector terminals 3 & 6
YES
Change pump supply cable
C
1.
CH system pressure 0.5 to 1.5 bar
2.
Check the tap of the automatic air
vent is opened
3.
Primary flow valve diaphragm damaged
D
1.
Continuity across flow micro-
switch and PCB - A5 con-
nector terminals 7 & 8
2.
Primary temperature sensor faulty.
Cold resistance approx. 11K ohms
3.
Fan connections correct at fan.
PCB - A5 connector, is 120V
across terminals 5 & 7
NO
YES
NO
If pump jammed, release
NO
NO
NO
YES
NO
NO
YES
NO
Check electrical supply
Replace fuse
Check wiring
Replace selector
Replace pump
Replace PCB
Re-pressurise system
Open the automatic air vent
Replace diaphragm
Flow valve rod obstructed
Replace microswitch
YES
Replace sensor
Fan jammed or faulty winding
Replace PCB
37
NO
neon
Replace PCB
illuminated
YES
Replace fan
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Table des Matières
