State SDV 75 70 NE/PE - Manual (Page 32)

32
Troubleshooting (cont’d)
ELECTRICAL SYSTEM CHECK
(Use diagram on page 31)
Visually check that all compo-
nents are wired correctly accord-
ing to wiring diagram on unit.
Correct by wiring according to
diagram.
Is on/off switch “ON”?
Go to “Thermostat and Gas
Supply Check” section.
Supply 110/120 volts.
Turn “ON”.
Is diagnostic indicator light
“ON”?
Replace control.
No
No
No
Yes
Yes
Yes
Yes
No
Is diagnostic indicator light
blinking?
Turn power “OFF” and back
“ON”.
Does power cord or power
wiring have 110/120 volts
available (receptacle and/or
junction box) with grounded
connector?
Thermostat is calling for heat.
(run cold water)
Yes
No
No
Is there a 115V
voltage between
I1 and I2?
No
No
Replace
control.
Yes
Replace hot surface ignitor
assembly.
Yes
Does burner light –
then go out?
Check flame sensor.
Make sure it is placed in
flame.
Replace hot surface
ignitor assembly.
Yes
No
Is blower running?
Yes
continued on next page
No
continued on next page
Yes
Does the hot surface
ignitor glow after power
is turned “ON”?
WARNING
Label all wiring before disconnecting any wiring; to
ensure correct reconnection. Failure to follow this
instruction could cause improper and possible danger-
ous operation, resulting in DEATH, SERIOUS BODILY
INJURY, OR PROPERTY DAMAGE.