Installation Guide

52
Figure 32: TROUBLESHOOTING
Code Fault Diagnosis Step Remedy
None
Heater will not
power up.
1. Check for Low & High
Voltage Output from Fuse
Board
Disconnect plug from P5 connector from Fuse Board. Measure
for 24VAC between pins of receptacle on Fuse Board. Reconnect
plug. Disconnect plug from P6 of Fuse Board. Measure for 120VAC
between pin 3 and 5 of receptacle on Fuse Board. Reconnect plug. If
OK, proceed to section titled ‘‘Low voltage circuit fault’’. Otherwise,
proceed to step 2.
2. Ensure eld power supply
to heater is turned on.
Measure for eld supply voltage across terminals of TB1 terminal block
on Fuse Board. If OK, proceed to step 3
3. Check for faulty Fuse
Board wiring.
Insoect Fuse Board wiring. Ensure all plugs are securely fastened to
Fuse Board. If OK, proceed to step 4.
4. Verify that FC1 and FC2
Fuses on Fuse Board are not
open.
Remove FC1 and FC2 fuses from fuseholder. Measure continuity
across fuse. If fuses are open, proceed to section titled ‘‘Open FC1 and/
or FC2 Fuses’’. If fuses are OK, reinstall them and proceed to step 5.
5. Verify that 240vac Voltage
Selector Plug is not installed
with a 120vac eld power
supply
Check that proper Volatage Selector Plug is installed in Fuse Board. If
OK, proceed to step 6
6. Check for defective
Transformer.
Disconnect plug from P4 connector from Fuse Board. Mesure for
24VAC between pins 1 & 2 of plug of Transformer and 120VA C
between pins 4 & 6. If 24VAC or 120VAC is not present, replace
Transformer. Otherwise, proceed to step 7.
7. Fuse Board is defective
Replace Fuse Board.
None
Low voltage
circuit fault.
1. Check for Low Voltage
Output from Fuse Board
Diconnect plug from P5 connector from Fuse Board. Measure for
24VAC across pins. Reconnect plug. If OK, proceed to step 2.
Otherwise, proceed to step 5.
2. Check for faulty Control
Module wiring.
Inspect Control Module wiring. Ensure all plugs are securly fastened to
Control Module. If OK, proceed to step 3.
3. Verify low voltage input
to Control Module.
Verify 24VAC across R and C terminals on Control Module. If not OK,
replace harness. If OK, procced to step 4.
4. Verify that F1 Fuse on
Control Board is not open.
Remove F1 fuse from fuseholder. Measure continuity across fuse. If
OK, replace Control Module. If fuse is open, proceed to section titled
‘‘Open FC3 or FC1 Fuses’’.
5. Verify that FC3 on Fuse
Board is not open
Remove FC3 fuse from fuseholder. Measure continuity across fuse. If
fuse is open, proceed to section titled ‘‘Open FC3 or FC1 Fuses’’. If
OK, reinstall fuse and proceed to step 6.
6. Check for defective
Transformer.
Disconnect plug from P4 connector from Fuse Board. Mesure for
24VAC between pins 1 & 2 of plug from transformer. If 24VAC is not
present, replace Transformer. Otherwise, proceed to step 7.
7. Fuse Board is defective
Replace Fuse Board
None
Open FC1 and/
or FC2 Fuses.
1. Verify that 120VAC
Voltage Selector Plug is not
installed with a 240VAC
eld power supply.
Check that proper Voltage Selector Plug is installed. If OK, proceed to
step 2.
If 120VAC plug is installed and eld supply voltage is 240VAC, FC1
and FC2 fuses will have to be opened. Install the correct Voltage
Selector Plug and new FC1 and FC2 fuses.
2. Check for faulty
Transformer wiring.
Inspect Transformer wiring. Ensure insulation on wiring is not worn. If
OK, proceed to step 3.
3. Defective Transformer
Replace Transformer.