3 - Trouble Shoot Ing; Error Messages And Resetting The Boiler - UTICA BOILERS MAHF-75 Installation, Operation And Maintenance Manual

1 3 .1 Error M essa ges And Reset t ing The Boiler
Error Descript ion
0 9 Gas valve connect ion fault
1 0 Out door sensor fault
1 5
Gas valve com m and fault
2 0 Cent ral Heat ing NTC sensor fault
2 8 Flue NTC heat exchanger sensor fault
4 0 Ret urn NTC sensor fault
5 0
Dom est ic Hot Wat er NTC sensor fault
Obstruction in flue pipe, Recirculation, Out of
5 3
Calibrat ion, Poor gas qualit y
5 5 PCB not program m ed
Com bust ion t est alarm during com m issioning /
E7 2 / E9 2
calibrat ion
7 8 Minim um gas valve I MOD current
7 9 Maxim um gas valve I MOD current
E8 3 OT Com m unicat ion Failure
8 4 - 8 5
Com m unicat ion problem bet ween boiler board and
cont rol unit
8 6 - 8 7
1 0 9 Pre- circulat ion alarm ( t em porary fault )
Safet y t herm ost at t ripped
due t o over t em perat ure
1 1 0
( pum p probably blocked or air in heat ing
circuit )
1 1 8 Hydraulic pressure t oo low.
1 1 7 Hydraulic pressure t oo high.
No circulat ion of wat er
1 2 5
( cont rol perform ed via t em perat ure sensor) .
Loss of flame 8 consecutive times after flame
proving st age.
1 2 8
NTC flue sensor tripped due to over temperature
1 3 0
Therm o fuse t ripped due t o over t em perat ure or
wire harness disconnected from thermo fuse, off
1 3 1
t he board, or wire harness m ay be cut .
I gnit ion failure
1 3 3
1 3 4 Gas supply valve blocked
1 3 - TROU BLE SH OOTI N G
Opera t ion
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
qualit y.
Follow inst ruct ions provided wit h cont rol board replacem ent kit ,
call t echnical service for assist ance.
Check flame sensor, check for obstruction in flue pipe, check
for recirculation, check gas pressure, check gas orifice, check
gas qualit y. Perform aut om at ic calibrat ion funct ion and m anual
calibrat ion funct ion if necessary.
Check gas supply pressure
Check t he correct posit ion and int egrit y of t he sensing elect rode
Check and clean t he ignit er and sensing elect rode if necessary
Check flue recirculation
Check Combustion is within specifications in IOM
Aut o calibrat e, m anual calibrat e if necessary
Replace com ponent s if all else fails
Check OT connect ion, rem ove power, reconnect OT
connect ions, if problem persist s replace service key.
Probable short circuit on wiring.
Check cable bet ween cont rol unit and boiler
Check correct circulat ion of wat er and pum p. Check supply and
ret urn wiring is correct .
Check safet y t herm ost at and cable; check correct circulat ion of
wat er and pum p
Refill heating system by opening cold water tap
Relieve pressure via relief valve or drain. Ensure wat er feed is
operat ing correct ly.
Check correct circulat ion of wat er and pum p.
Check correct connect ion of NTC sensor on pipe
Check sensing electrode and cable, flue recirculation,
elect rical cont inuit y bet ween burner and ground, gas
pressure, gas orifice.
m anual calibrat ion funct ion if necessary.
Check t herm ost at , correct circulat ion of wat er and pum p.
Check st at us of prim ary exchanger.
Check t herm o fuse, correct circulat ion of wat er and pum p.
Check st at us of prim ary exchanger. Replace heat exchanger.
Verify wire harness inst allat ion and cont inuit y.
Check correct operat ion of condensat e t rap. Check
sensing electrode, spark electrode and cable. Check flue
recirculat ion, elect rical cont inuit y bet ween burner and ground.
Check gas orifice and gas pressure. Perform automatic
calibrat ion and m anual calibrat ion funct ion if necessary.
Check gas pressure, sensing elect rode, spark elect rode and
cable, replace PCB if it necessary.
6 8
Perform automatic calibration and
240013503 REV A, [ 03/ 15/ 2022]