25
Fault Finding Solutions Sections A to K
Is there 120V at:
Main terminals L and N
Check electrical supply
1.
NO
Main terminal fuse
Replace fuse
Replace PCB
2.
YES
Selector terminals a & b and
a & 3. PCB - A4 connector
terminals 4 & 5
Check wiring
Replace selector
3.
NO
NO
A
neon
illuminated
YES
NO
Temperature sensors faulty.
Cold resistance approx. 11K ohms
Replace sensor
YES
Fan connections correct at fan.
PCB - A5 connector, is 120V
across terminals 5 & 7
Fan jammed or faulty winding
Replace PCB
Replace fan
YES
B
C
Check and correct if necessary
1. Electrical and pressure tube connections
2. Blockage of pressure tubes
3. Restriction in flue
4. Venturi
NO
D
Replace air pressure
switch
Gas at burner
Ensure gas is on and purged
Replace PCB
Replace gas valve
neon flashing
PCB - A1 connector has 120V AC
across terminals 2 & 4
YES
Turn selector switch to
reset position R
YES
NO
NO
NO
E
Summary of Contents for NIAGARA
Page 23: ...23 9 Wiring diagrams 9 Schéma de câblage Fig 29 ...
Page 30: ...30 COMBUSTION BOX ...
Page 31: ...31 HYDRAULICS ...
Page 33: ...33 ...
Page 34: ...34 ...
Page 35: ...35 ...