UTICA BOILERS MAHF-75 Installation, Operation And Maintenance Manual page 73

1 3 .1 Er r or M e ssa ge s a n d Re se t t in g t h e Boile r - con t in u e d
Error Descript ion
1 3 5 I nt ernal error
1 6 0 Fan fault
1 6 2 / 3 1 7 I ncorrect power supply frequency.
1 6 9 Flue pressure swit ch ( cont act open)
Fault flame (parasitic flame).
1 6 4 / 3 8 4
1 6 5 / 3 8 5 I nput volt age t oo low.
Low ret urn wat er t em perat ure / ant i- freeze
E1 7 8
funct ion act ive
To RESET boiler press
For ot her error codes not described in t able please cont act m anufact urer at 1( 800) 325- 5479.
Anom a lies Only Displa yed in t he Fa ult H ist ory
Ant i- wind act ivat ion wit h increase of t he m inim um
E6 2
fan speed
E6 3 / E6 5 Com bust ion level out of range
Maxim um value of t he speed reached / correct ion of
E6 5
the flame signal
E6 7 Ant i- wind act ivat ion at m axim um power
E6 9 Com bust ion level out of range
Flam e signal problem / m icro int errupt ion of t he
E7 0
flame signal
Combustion adjustment / modified during operation
E7 3
1 3 - TROU BLE SH OOTI N G
but t on for at least 2 seconds.
Opera t ion
Verify all cables. Replace PCB.
Check fan and cable
I ncorrect power supply frequency.
Check pressure swit ch and cable.
Check obstruction on flue pipe
Check correct operat ion of T. gas valve.
Check power supply
Check t he ret urn wat er sensor, check t he circulat or, check t he
correct circulat ion of t he wat er. Boiler will exit st at us when
condit ion is resolved.
Check the position of the terminal of the flue duct.
Check flue recirculation and combustion levels.
Check flue recirculation on the flue duct.
Check the position of the terminal of the flue duct.
Check flue recirculation and the combustion levels.
Check cable and int egrit y of t he sensing elect rode, verify t he
cont inuit y bet ween burner and eart h.
Review and m onit or ot her codes such as E5 3 and E9 2
6 9
240013503 REV A, [ 03/ 15/ 2022]