NTI INSTALLATION MANUALS

Part 13 - Troubleshooting

Display Error code

Possible cause based on priority

Error Type

Error Description

Possible Remedies

Ensure the condensate is draining freely and the tubing to the switch is clear. If the problem only occurs when the front cover is on, there is too much restriction in the intake vent. Check the exhaust and air-intake venting for blockages. Inspect the wires from the air switch to the boiler control. Disconnect and reconnect each connection. Inspect the wires from the exhaust sensor to the boiler con trol. Disconnect and reconnect each connection. Dry or clean any wet or corroded wires. Test the ue temperature sensor using a multimeter, compare with the temperature resistance chart. Replace the sensor. Check the 4 wire harness between the fan and PCB for damage and check it for continuity (Blue-Brown-Black-Red). On the 3-wire harness,verify 120Vac between black and white. Remove the 4-wire harness from the blower, if it does not run at high speed replace the blower. If the wiring and blower are ok, the main PCB is not sending the correct PWM signal. Replace the PCB. Allow the boiler to operate the burner in heating or hot water mode for 5 minutes without interruption. The boiler will return to normal operation on its own. Check the EBUS connection and wires for damage or shorts. EBUS wiring is polarity sensitive and cannot be connected to other manufacturers clip in module, control or room sensor or another EBUS connection on another boiler. EBUS connector CN24 pin 11-12. Select menu 0.4.6 set the boiler address. Slave boilers must be set to B-FL1 up to B-FL7, the master boiler must be set to B-MAS If not using a cascade set to B-sin, for stand alone boiler. Only 1 boiler can be set to B-MAS and each slave boiler must have a unique address B-FL1 between and B-FL7. Check the EBUS connection and wires for damage or shorts. EBUS wiring is polarity sensitive and can only be connected to NTI room sensors, or zone controls, 0-10VDC clip in module or another EBUS connection on di erent boiler. EBUS connector CN24 pin 11-12. Select menu 0.4.6 set the boiler address. Slave boilers must be set to B-FL1 up to B-FL7, the master boiler must be set to B-MAS If not using a cascade set to B-SIN, for stand alone boiler. Only 1 boiler can be set to B-MAS and each slave boiler must have a unique address B-FL1 between and B-FL7. The master boiler must be powered at all times when in a cascade. If you wish to prevent burner operation use the power button on the boiler display. The Bus wiring is polarity sensitive ensure wiring is connected such that the T connection on each cascade boiler is connected to every other T and B is connected to B. Replace the air switch.

Blocked Condensate

Blocking (Manual Reset)

Blocked vent

Blocked condensate switch open

6 03

Wiring problem

Air switch failure

Faulty wiring

"Exhaust Temperature sensor circuit open or short circuit"

Blocking (Auto Reset)

6 05

Faulty sensor

Faulty wiring between control and blower.

Blocking (Manual Reset)

Blower did not achieve the proper RPM speed

6 12*

Faulty Blower

Improper PWM Signal

Normal operation on new start up.

6 19

Power Limiting Mode

EBUS wiring (orange connector)

After the issue is corrected the error will clear.

"There is a problem with the boiler address settings or EBUS wiring "

NOAVL

Incorrect setting

EBUS wiring (orange connector) disconnected

Cascade boiler lost communication

NOTE: When in Emergency Mode the boiler operates in CH mode with a target boiler temperature=Emergency Setpoint (2.10.3 for Master boiler, 34-40.10.3 for Follower boilers).

Incorrect settings

EMERG

Master boiler in Cascade turned o

Incorrect wiring

98