50
TROUBLESHOOTING

Ste

p

8

Ste

p

7

Ste

p

6

Ste

p

9

Step1

Step2

Step3

Step4

Step5

Isthere a Call For
Heat?
IsDisable connection intact?
Doesthe combustion air
blower come on?
Is4-20mA present at the quick
disconnectson the black and blue
wiresof the tem
p
eraturecontrolle
r
?
Is24VAC at the NC side of
theair pressure switch?
DoesF2 on ignition module
haveAC
p
owe
r
?
Isblower pressure setting
(vacuum)correct?
Doesi
g
niter
p
rove?
Isairswitch bouncing?
Callour Technical Service Department
1-800-947-2975Outside California
1-800-627-2975 Inside California
Replacegas valve
Isgas pressure correct?
Isthere continuity in the wire
between F2 andPin J5-6?
Replaceairpressure switch.
Correct the shutter
setting orblower
ampdraw.
NO Check theswitch and/or
line voltage
YES
Doesthe power switch provide
power to the control panel?
Unit is in standbymode.
Reattach.
NO
NO
YES
YES
NO
Isdiagnosticboard
indicating open
safeties?
Check andcorrect power
connectionsat main terminal
block,circuitbreaker panel or
blower relay.
NO
NO
YES
NO
YES
Is24VAC at PS on ignition module?
Isconnecting plug secure?
NO
NO
NO
YES
NO
Isthe flame sensor signal to the
i
g
nition module
g
reaterthan 1 uA DC?
YES
Theunit is oka
YES
YES
ReplaceHSI
NO Correct thegas pressure.
NO
Repairor
Re
p
lace wire.
Correct wiring.
YES
YES
NO
NO
YES
YES
IsAmp draw during heat-
upfor HSI greater than
3.1Amps?
NO
YES
YES
Isthere 120VAC at the blower or
blower relay?
Isthe unit runnin
g
?
NO
Isstatic and dynamic inlet gas
pressurecorrect?
YES
NO
Replace temperature
controller.
CorrectSafet
y
YES
NO
Check filter,