TROUBLESHOOTING
Ste p 8
Ste p 7
Ste p 6
Ste p 9
Step 1
Step 2
Step 3
Step 4
Step 5
Is there a Call For
Heat?
Is Disable connection intact?
Does the combustion air
blower come on?
Is 4-20mA present at the quick
disconnects on the black and blue
wires of the tem p erature controlle r ?
Is 24VAC at the NC side of
the air pressure switch?
Does F2 on ignition module
have AC p owe r ?
Is blower pressure setting
(vacuum) 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 gas pressure correct?
Is there continuity in the wire
between F2 and Pin J5-6?
Replace air pressure switch.
Correct the shutter
setting or blower
amp draw.
NO
Check the switch and/or
line voltage
YES
Does the power switch provide
power to the control panel?
Unit is in standby mode.
Reattach.
NO
NO
YES
YES
NO
Is diagnostic board
indicating open
safeties?
Check and correct power
connections at main terminal
block, circuit breaker panel or
blower 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
Correct the gas pressure.
NO
Repair or
Re p lace wire.
Correct wiring.
YES
YES
NO
NO
YES
YES
Is Amp draw during heat-
up for HSI greater than
3.1 Amps?
NO
YES
YES
Is there 120VAC at the blower or
blower relay?
Is the unit runnin g ?
NO
Is static and dynamic inlet gas
pressure correct?
YES
NO
Replace temperature
controller.
Correct Safet y
YES
NO
Check filter,
California Hot Water Supply, Inc.
(800) 249-7244
49
