Trouble Shooting; Error Messages And Resetting The Boiler - UTICA BOILERS MAHF-100 Manual

13.1 Error Messages And Resetting The Boiler

Error Description
09 Gas valve connection fault
10 Outdoor sensor fault
15 Gas valve command fault
20
Central Heating NTC sensor fault
28
Flue NTC heat exchanger sensor fault
40
Return NTC sensor fault
50 Domestic Hot Water NTC sensor fault
Obstruction in flue pipe, Recirculation, Out of
53
Calibration, Poor gas quality
55 PCB not programmed
Combustion test alarm during commissioning /
E72/E92
calibration
78 Minimum gas valve IMOD current
79 Maximum gas valve IMOD current
E83
OT Communication Failure
84-85
Communication problem between boiler board and
control unit
86-87
109 Pre-circulation alarm (temporary fault)
Safety thermostat tripped
due to over temperature
110
(pump probably blocked or air in heating
circuit)
118 Hydraulic pressure too low.
117 Hydraulic pressure too high.
No circulation of water
125
(control performed via temperature sensor).
Loss of flame 8 consecutive times after flame
proving stage.
128
130 NTC flue sensor tripped due to over temperature
Thermo fuse tripped due to over temperature or
131
wire harness disconnected from thermo fuse, off
the board, or wire harness may be cut.
Ignition failure
133
134 Gas supply valve blocked

13 - TROUBLE SHOOTING

Operation
Check cable PCB/gas valve and gas valve plug
Check sensor and cable
Verify all cables. Replace PCB.
Check sensor and cable
Check sensor and cable
Check sensor and cable
Check sensor and cable
Check for obstruction in flue pipe. Check gas pressure, check
gas orifice. Check for recirculation, recalibrate, check gas
quality.
Follow instructions provided with control board replacement kit,
call technical service for assistance.
Check flame sensor, check for obstruction in flue pipe, check
for recirculation, check gas pressure, check gas orifice, check
gas quality. Perform automatic calibration function and manual
calibration function if necessary.
Check gas supply pressure
Check the correct position and integrity of the sensing electrode
Check and clean the igniter and sensing electrode if necessary
Check flue recirculation
Check Combustion is within specifications in IOM
Auto calibrate, manual calibrate if necessary
Replace components if all else fails
Check OT connection, remove power, reconnect OT
connections, if problem persists replace service key.
Probable short circuit on wiring.
Check cable between control unit and boiler
Check correct circulation of water and pump. Check supply and
return wiring is correct.
Check safety thermostat and cable; check correct circulation of
water and pump
Refill heating system by opening cold water tap
Relieve pressure via relief valve or drain. Ensure water feed is
operating correctly.
Check correct circulation of water and pump.
Check correct connection of NTC sensor on pipe
Check sensing electrode and cable, flue recirculation,
electrical continuity between burner and ground, gas
pressure, gas orifice.
manual calibration function if necessary.
Check thermostat, correct circulation of water and pump.
Check status of primary exchanger.
Check thermo fuse, correct circulation of water and pump.
Check status of primary exchanger. Replace heat exchanger.
Verify wire harness installation and continuity.
Check correct operation of condensate trap. Check
sensing electrode, spark electrode and cable. Check flue
recirculation, electrical continuity between burner and ground.
Check gas orifice and gas pressure. Perform automatic
calibration and manual calibration function if necessary.
Check gas pressure, sensing electrode, spark electrode and
cable, replace PCB if it necessary.
65
Perform automatic calibration and
240013371 REV B, [10/01/2021]