Install Instructions

92
13 Troubleshooting
FAULT CAUSE CORRECTIVE ACTION
C˘˖ˋ˒ B˘˒˕ˎ˛
˒˜ R˞˗˗˒˗ː
ˋ˞˝ D˘ˎ˜ N˘˝
S˞˙˙˕ˢ Hˎˊ˝ˎˍ
Wˊ˝ˎ˛ ˝˘
S˙ˊˌˎ H ˎˊ˝˒˗ː
Sˢ˜˝ˎ˖
(C˘˖ˋ˒ O˗˕ˢ)
A DHW demand is present.
• Wait until DHW demand has ended, then combi
unit should provide heated water to the space heating
system. The Noble Fire Tube does not provide
heated water during a DHW demand.
Diverter valve is not in DHW position (heated
boiler water is being provided to the combi
plate heat exchanger rather than to the
space heating system).
• Check wiring harness connections between the Low
Voltage Connection Board (CN4) and the combi
diverter valve motor.
• Check that diverter valve motor is operating.
• Verify that the voltage between wire CN4-1 and
ground is 24 Vac during a space heating demand.
• Replace combi diverter valve motor, Low Voltage
Connection Board, or wire harness.
S˙ˊˌˎ
Hˎˊ˝˒˗ː
Sˢ˜˝ˎ˖ Hˎˊ˝
E˖˒˝˝ˎ˛˜ G ˎ˝
H˘˝ D˞˛˒˗ː
ˊ DHW
D˛ˊˠ ˊ˗ˍ
˝ˑˎ C˘˖ˋ˒
B˘˒˕ˎ˛ ˍ˘ˎ˜
˗˘˝ P˛˘˟˒ˍˎ
H˘˝ E˗˘˞ːˑ
D˘˖ˎ˜˝˒ˌ H˘˝
Wˊ˝ˎ˛
(C˘˖ˋ˒ O ˗˕ˢ)
Diverter valve not operating correctly.
• Verify diverter valve motor operation. If combi diverter
valve motor is operating correctly, replace the flow
group on the combi water set.
• Verify wiring harness connections between the Low
Voltage Connection Board, and the diverter valve motor,
and between the main control board and the Low
Voltage Connection Board.
• Verify that voltage between CN4-2 and ground is 24
Vac and that voltage between CN4-1 and ground is 0
Vac. If voltages are incorrect, replace the Low Voltage
Connection Board, wire harness, or main control
board.
• If voltages are correct and diverter valve motor is not
operating correctly, replace the combi diverter valve
motor.
L˘ˌ˔˘˞˝!
Wˊ˝ˎ˛ P˛ˎ˜˜
Sˠ˒˝ˌˑ
Water pressure switch open.
• Verify water pressure at boiler.
• Verify harness connection.
• Verify voltage at pressure switch.
• Replace pressure switch.
Installation & Service Manual
Table 13-3 (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface
FIRE TUBE
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