Trouble Shooting; Error Messages And Resetting The Boiler - UTICA BOILERS MAH-125 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
83-84-85
Communication problem between boiler board and
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.
169 Flue pressure switch (contact open)
164/384 Fault flame (parasitic flame).
165/385 Input voltage too low.
To RESET boiler press
For other error codes not described in table please contact
manufacturer at 1(800) 325-5479.

13 - TROUBLE SHOOTING

button for at least 2 seconds.
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 for recirculation,
recalibrate, check gas quality
Call authorized SERVICE center
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.
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. 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.
Check pressure switch and cable.
Check obstruction on flue pipe
Check correct operation of T. gas valve.
Check power supply
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240011941 REV B, [03/31/2018]