10
WEBCS-1 09/18
Sequence of
Operation
Fault
Check
Result
Action(s)
Power ON
No Function/No LED
Check for 12V at trans
-
former
No or low voltage Make sure transformer is powered. If so,
replace transformer.
Check for 12V at con
-
trol box
No or low voltage Check wiring for continuity, replace if bro
-
ken.
Ensure wire is <50 feet long and 16AWG
minimum (smaller number is bigger wire).
Replace with larger wire or shorten length.
Replace with correct wiring if incorrect.
Check fuse on HTC01
control module
Fuse OK
Replace control module
Fuse blown
Check wiring and replace fuse. If fuse blows
again, there is a short in the wiring, igniter,
gas valve or control module. Locate shorted
component and replace.
Igniter warm-up
LED on, no igniter
Check for breaks in
igniter
Broken
Replace igniter.
Check igniter wiring
and connector
Damaged or bro
-
ken
Repair.
Trial for ignition
Igniter ON, does not light.
Control goes through all
ignition attempts then en-
ters 2 LED flash lockout
Is pilot valve opening?
No. Pilot gas flow Check input gas pressure. Maximum pres
-
sure 1/2 PSI. Install regulator if higher.
Check voltage to pilot valve. Voltage should
read >10.2VDC. Check "No or Low Voltage"
above if less.
Check pilot coil for open circuit. Replace
pilot valve if open.
Yes. Gas flow at
pilot No ignition/
low flame
Ensure air has been bled from gas line
Consult burner manufacturer for minimum
gas pressure.
If natural gas, ensure pilot jet is not for LP
Check pilot injector for clogged jet. Clean
or replace.
If pilot can be lit with a match, check igniter
position and adjust, or check "No or Low
Voltage" above.
Pilot lights but goes off at
end of trial without main
burner. 2 flash lockout
after end of trials. Flame
is not detected.
Ensure pilot flame is
impinging on the ther-
mocouple
No
Check for clogged pilot or injector and clean.
Check for correct pilot injector. (LP or Nat)
Is the thermocouple
securely connected to
the control box?
No
Tighten connection
Yes
Replace thermocouple
Burner ON
Unit shuts down after
flame detected
LED flashing 3 times,
no recycle?
Yes
Maximum flame losses per heat cycle ex
-
ceeded. Recycle power to reset.
Ensure pilot flame is impinging on the
thermocouple and is adequately sheltered
from the wind. If impingement is consistent
and no wind present, replace thermocouple.
LED flashing 4 times,
no recycle? (Flame
sense fault)
Yes
Turn power off for 10 seconds and back on.
If persistent, replace control module
LED flashing 5 times,
no recycle? (Valve
Fault)
Yes
Turn power off for 10 seconds and back on. If
persistent, check "No or Low Voltage" above.
If voltage is okay, replace control module.
Shuts down before
main burner lights
Yes
Check "No or Low Voltage" above
Shuts down after being
on for several minutes
or hours and does not
relight
Yes
Over temperature - ensure control compart-
ment remains under 175° F. If continued
operation above this temperature, life of
product will be reduced.
Unit shuts down for 1
minute every 24 hours
Yes
This is normal operation for validation of
safety circuitry.
TROUBLESHOOTING
