Trouble Shooting; Error Messages And Resetting The Boiler - UTICA BOILERS MAHF-165 Installation, Operation And Maintenance 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
E83
OT Communication Failure
Communication problem between boiler board and
84-86-87
control unit
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
128
130 NTC flue sensor tripped due to over temperature
Thermo fuse tripped due to over temperature or
wire harness disconnected from thermo fuse, off
131
the board, or wire harness may be cut.
Ignition failure
133
134 Gas supply valve blocked
135 Internal error
160
Fan fault
162/317
Incorrect power supply frequency.

13 - TROUBLE SHOOTING

Operation
Check cable PCB/gas valve and gas valve plug
Check sensor and cable
Verify all cables. Replace PCB.
Call authorized SERVICE center
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.
Call authorized SERVICE center
Check flame sensor, check for obstruction in flue pipe, check
for recirculation, check gas pressure, check gas orifice, check
gas quality. Perform Calibration Function.
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. Enable automatic calibration.
Call authorized SERVICE center.
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. Call authorized SERVICE center.
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.
Enable automatic calibration function.
Call authorized SERVICE center
Check gas pressure, sensing electrode, spark
electrode and cable, replace PCB if it necessary.
Call authorized SERVICE center
Verify all cables. Replace PCB.
Call authorized SERVICE center
Check fan and cable
Incorrect power supply frequency.
56
240012874 REV A, [01/31/2020]