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YES
Ste
p
9
HD101-HD401 Troubleshooting
YES
YES
NO
NO
YES
YES
NO
YES
YES
NO
YES
YES
NO
NO
YES
NO
Ste
p
10
YES
NO
YES
YES
NONO
YES
NO
Yes
NO YES
YES
NO
S
tep 1
S
tep 2
S
tep 3
Step 4
Step 5
Step 6
Step 7
Step 8
Is there a Call For Heat?
Is Disable connection intact?
Does the Pump come on?
Is 24VAC at the NO side of
the air pressure switch?
Is blower pressure setting
correct? Should be about 0.5”
W.C. (low speed)
Does i
g
niter
p
rove?
Call our Technical Service Department
1-800-947-2975 Outside California
1-800-627-2975 Inside California
Replace low air pressure switch.
Correct the blower
shutter setting.
NO
Check the switch, transformer
and/or line voltage
YES
Is temperature controller
installed?
Reattach.
NO
YES
Check and correct power
connections at main terminal
block, circuit breaker panel or
pump relay.
NO
NO
NO
Is 24VAC at PS on ignition module?
Is connecting plug secure?
NO
NO
Is the flame sensor signal to the ignition
module
g
reater than 1 Micro Am
p (µ
A
)
DC?
The unit is okay
YES
Replace HSI
NO
Adjust manifold gas
pressure.
Correct wiring.
Is Amp draw during heat-
up for HSI greater than
3.1 Amps?
YES
Is there 120VAC at the pump or
pump relay contacts?
Does the unit run longer
than 10 seconds?
Is manifold gas
pressure correct?
Install.
NO
Check and correct power
connections at main terminal
block, ignition module, circuit
breaker
p
anel or blower rela
y
.
Is there120 VAC at the blower,
between the red & white leads?
NO
NO
Correct inlet gas supply pressure
Does the main power switch provide
power to the green power LED?
Check safeties, I.E. Flow switch, high
limit, vent switch, thermostat, etc.
NO
Does the combustion air
blower come on?
Is the air filter or
air intake blocked?
Remove blockage
and/or replace filter
Replace gas valve
Does the air pressure
reach 0.9” W.C.?
Replace high air pressure switch
Does the unit run at least
5 seconds?
Re
p
lace blowe
r
Remove blockage
and/or replace filter
Is the air filter or air
intake blocked?
Is inlet gas supply pressure
correct?
Is the polarity of incoming
power supply correct?
Correct su
pp
l
y
wirin
g
Re
p
lace Senso
r
Is sensor
p
robe
g
rounded?
Is air switch bouncing?