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13
Troubleshooting
(continued)
Table 13-4 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
ERROR CODE
DESCRIPTION
CORRECTIVE ACTION
LOW VOLTAGE
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.
NO FLUE TEMP
CHANGE
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.
COMBI SENSOR
FAULT
DHW sensor is not connected (combi only).
• Check the DHW sensor and its associated wiring.
Repair or replace as needed.
LOCKOUT INLET
SENSOR FAULT
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 76 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 76 of this
manual.
• Replace the sensor if necessary.
OUTDOOR
SENSOR MISSING
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 76 of this
manual.
• Replace the sensor if necessary.
Installation & Service Manual
F I R E T U B E C O M B I
™
