State SDV 75 70 NE/PE - Manual (Page 33)

33
Troubleshooting (cont’d)
Remove venting
system restrictions.
Check at #4 for 115V to
ground.
Replace Hi-limit switch.
Yes
Yes
If OK
Yes
No
No
Check at #7 for 115V to
ground.
Replace control.
continued from facing page
Check at #2 for 115V to
ground.
Replace blower. Replace/correct wiring.
Yes Yes
No
Check at #8 for 115V to
ground.
Is burner “ON”?
Yes
All systems operational.
No
Check 1 /
4
″ WC pres-
sure at line to air
pressure switch.
If OK
Replace air
pressure switch.
No
Replace thermostat.