23
6.4 SERVICING - FAN TIMER ST9103A1028
Honeywell electronic board ST9103
Before trouble shooting the board,
check for the 5 amp. fuse
For accurate trouble shooting,
follow
step by step
the Trouble Shooting Chart
.
Step
Possible Cause
Check-out procedure
Corrective action
No Heat
1
Incoming supply
Check for 120 Volts
between terminal S2 and
3 on electronic fan control
Yes - Move to next step
No - Check breaker main power
switch
2
Transformer
Check for 120 Volts
between terminal S3 and 4
on electronic fan control.
Check for 24 Volts
between terminal X and C
on electronic fan control
Yes - Move to next step
No - Check for bad connection
Yes - Move to next step
No - Change Transformer
3
Electronic Fan
control
Check for 24 Volts between
R and C
Check for 24 Volts
between terminal W and C
Yes - Move to next step
No - Change the electronic board
Yes - Move to next step
No - Check thermostat and wiring
4
Warning: Make sure the quick connect cable is fully inserted on the board
Limit Control
Check for 120 Volts on
each terminal of the high
limit
Check for 120 Volts coming
from the main plug-in of the
electronic fan control to the
limit control
Yes - Move to step # 5
No - Move to next step
Yes - Move to next step
No - Change the electronic fan
control
Check
for
120 Volts
coming out of the limit
control
Yes - Move to step # 5
No - Failure on the limit control circuit
.
Temperature too high
.
Bad limit control
Summary of Contents for KLF-100
Page 7: ...7 KLR 200 DIMENSIONS Dimensions are in inches KLF 100 DIMENSIONS Dimensions are in inches...
Page 22: ...22 Position of the ST9103A1028 Electronic Board KLR 100 and 200 KLF 100 KLF 200...
Page 28: ...28 8 0 ELECTRICAL WIRING DIAGRAMS HEATING COOLING KLR KLF RIELLO...
Page 29: ...29 HEATING COOLING For more informations see next page...
Page 30: ...30 GeniSys control schematic with the ST9103 Board...
Page 31: ...31 HEATING ONLY RIELLO BECKETT...
Page 34: ...34 KLR 200 EXPLODED PARTS VIEW Detail A ELB A0 0008 00 Electric box...
