UTICA BOILERS MAH-100 Manual page 72

13.1 Error Messages and Resetting the Boiler - continued
Error Description
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.
Low return water temperature / anti-freeze
E178
function active
To RESET boiler press
For other error codes not described in table please contact manufacturer at 1(800) 325-5479.
Anomalies Only Displayed in the Fault History
Anti-wind activation with increase of the minimum
E62
fan speed
E63/E65 Combustion level out of range
Maximum value of the speed reached / correction of
E65
the flame signal
E67 Anti-wind activation at maximum power
E69 Combustion level out of range
Flame signal problem/micro interruption of the
E70
flame signal
E73 Combustion adjustment / modified during operation
13 - TROUBLE SHOOTING
button for at least 2 seconds.
Operation
Verify all cables. Replace PCB.
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
Check the return water sensor, check the circulator, check the
correct circulation of the water. Boiler will exit status when
condition 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 integrity of the sensing electrode, verify the
continuity between burner and earth.
Review and monitor other codes such as E53 and E92
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240013354 REV B [09/15/2021]