UTICA BOILERS MAHF-75 Installation, Operation And Maintenance Manual page 135

FAU LT SO LU T I O N SECT I O N S
PCB connector x22 Hall
With water running
effect sensor terminals.
Is main water filter and
through DHW circuit,
L
YES YES YES
YES Check the voltage is Check DHW NTC
assembly clean and
measure red and white
Replace PCB
approximately 5 VDC
senor for proper OHM
rotor free to move?
wire for 2.8 VDC for
between the Red and
value
flow triggering.
Blue wires. See Wiring
Diagrams.
N O N O N O
N O
Clean or Replace Replace Hall Effect Sensor Replace DHW NTC sensor
Replace PCB
5 1
PN 240012875 REV. D [ 03/ 15/ 2022]