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F. Troubleshooting problems where a Soft Lockout Code is displayed.
boiler will shut down and the "Help" button will "blink". Select the "blinking" "Help" button to determine the cause of the
soft lockout. The boiler will automatically restart once the condition that caused the lockout is corrected.
Soft Lockout Codes Displayed
Lockout
Number
2
Boiler Safety Limit wired to terminals J6-1 or
3 OPEN:
•
External Limit.
Boiler Safety Limit
Open
•
Optional LWCO
3
Blocked Flue/Inlet Switch wired to terminals
Boiler Safety Limit
J5-1 OPEN
Open
7
Return sensor
Shorted or open return temperature sensor.
(10 KOhms) fault
8
Supply sensor
Shorted or open supply temperature sensor.
(10 KOhms) fault
9
DHW sensor
Shorted or open DHW sensor.
(12 KOhms) fault
10
Shorted or open flue gas (stack) temperature
Stack sensor
sensor.
(10 KOhms) fault
Flame failure after 5 tries to restart. Flame
11
rod not detecting flame.
Ignition failure
•
Condensate trap plugged.
107774-01- 9/17
XV. Troubleshooting
Condition
(continued)
External Limit:
•
Water temperature is higher than External Limit setting. See "Hard
Lockout 4" for additional information.
•
External device not used and jumper not installed.
•
External Limit device is defective.
•
Loose wiring to limit device
Optional Low Water Cut Off (LWCO)
•
If yellow light on LWCO is on, system is low on water. Ensure air vent
is unobstructed and properly functioning as a blocked air vent can result
in low water indication.
•
If neither yellow or green light on LWCO is on, check LWCO harness.
•
Blocked Flue/Inlet Switch contact open - check for blocked flue/air intake.
Blocked Flue/Inlet Switch Special Note
Before a call for heat the air pressure switch is closed. When there is a call
for heat with a blocked vent the air pressure switch will open (due to excessive
pressure of the blower against a blocked flue pipe) after the blower starts. The
control stops the start sequence and stops the blower. After the blower stops
the pressure switch re-closes and the cycle continues. The displays shows
the cause of trip for only the time the pressure switch is open.
•
Shorted or mis-wired return sensor wiring.
•
Defective return sensor.
•
Shorted or mis-wired supply sensor wiring.
•
Defective supply sensor.
•
Shorted or mis-wired DHW sensor wiring.
•
Defective DHW sensor.
•
Shorted or mis-wired flue temperature sensor wiring.
•
Defective flue temperature sensor.
•
No gas pressure.
•
Gas pressure under minimum value shown on rating plate.
•
Gas line not completely purged of air.
•
Defective Electrode.
•
Loose burner ground connection.
•
Defective Ignition Cable.
•
Defective gas valve (check for 24 Vac at harness during trial for ignition
before replacing valve).
•
Air-fuel mixture out of adjustment - consult factory.
•
Defective or fouled electrode.
•
Plugged drain line in trap.
When a soft lockout occurs, the
Possible Cause
NOTE
135
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