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Ste
p
8
HD Troubleshooting
Ste
p
8
Ste
p
9
Step 1
Step 2
Step 3
Step 4
Step 5
Step 6
Step 7
Is there a Call For Heat?
Is Disable connection intact?
Does the Pump come on?
Is 24VAC at the NC side of
the air pressure switch?
Is blower pressure setting
correct?
Does i
g
niter
p
rove?
Is air switch bouncing?
Call our Technical Service Department
1-800-947-2975 Outside California
1-800-627-2975 Inside California
Replace gas valve
Is inlet gas supply pressure
correct?
Replace air pressure switch.
Correct the blower
shutter setting.
NO
Check the switch, transformer
and/or line voltage
YES
Does the main power switch provide
power to the green power LED?
Is temperature controller
installed?
Reattach.
NO
YES
Check and correct power
connections at main terminal
block, circuit breaker panel or
pump relay.
NO
NO
YES
NO
YES
Is 24VAC at PS on ignition module?
Is connecting plug secure?
NO
NO
NO
YES
NO
Is the flame sensor signal to the
i
g
nition module
g
reater than 1 uA DC?
YES
The unit is oka
y
YES
YES
Replace HSI
NO
Adjust manifold gas
pressure.
NO
Correct wiring.
YES
YES
NO
YES
YES
Is Amp draw during heat-
up for HSI greater than
3.1 Amps?
NO
YES
Is there 120VAC at the pump or
pump relay contacts?
Is the unit runnin
g
?
NO
Is manifold gas pressure
correct?
YES
NO
Install.
NO
Does the combustion air
blower come on?
Check and correct power
connections at main terminal
block, ignition module, circuit
breaker panel or blower relay.
Is there 120VAC at the blower or
blower relay contacts 1 and 5?
NO
NO
YES
Correct inlet gas supply pressure