Install Instructions

90
13 Troubleshooting
Table 13-3 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
ERROR CODE DESCRIPTION CORRECTIVE ACTION
L˘ˠ V˘˕˝ˊːˎ
120 vac input to the main control board has
dropped below 80 vac.
• Check 120 vac supply to the transformer.
• Check wiring connections at the low voltage
terminal strip.
• Check the wire size/length to remote devices.
• Replace the transformer.
• Check 24V.
N˘ F˕˞ˎ Tˎ˖˙
Cˑˊ˗ːˎ
The flue temperature did not change after
the burner started firing.
• Verify that the flue sensor is installed.
• Check the sensor and its associated wiring. Repair or
replace the sensor or wiring if damaged.
C˘˖ˋ˒ Sˎ˗˜˘˛ Fˊ˞˕˝
(C˘˖ˋ˒ O˗˕ˢ)
DHW sensor is not connected (combi only).
• Check the DHW sensor and its associated wiring.
Repair or replace as needed.
L˘ˌ˔˘˞˝ I˗˕ˎ˝
Sˎ˗˜˘˛ Fˊ˞˕˝
The inlet sensor has been disconnected.
• Check the sensors and their associated wiring.
Repair or replace the sensor or wiring if damaged.
• Measure the resistance of the sensors and compare
the resistance to the tables on page 83 of this
manual.
• Replace the sensor if necessary.
The inlet sensor has been shorted.
• Check the sensors and their associated wiring.
Repair or replace the sensor or wiring if damaged.
• Measure the resistance of the sensors and compare
the resistance to the tables on page 83 of this
manual.
• Replace the sensor if necessary.
O˞˝ˍ˘˘˛ Sˎ˗˜˘˛
M˒˜˜˒˗ː
The outdoor sensor has opened or shorted.
• Check the sensors and their associated wiring.
Repair or replace the sensor or wiring if damaged.
• Measure the resistance of the sensors and compare
the resistance to the tables on page 83 of this
manual.
• Replace the sensor if necessary.
Installation & Service Manual
FIRE TUBE
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