Fa Ult Solut Ion Sect Ions - UTICA BOILERS MAHF-75 Installation, Operation And Maintenance Manual

Fault Finding Solutions Sections
A
Power supply 120V
1. Main terminals L and N
2.
Integrity of the fuse
3.
PCB - X1 0 connector
Mains terminals L & N
B
120V at PCB -connector x13 pump terminals Blue
to Brown (See Wiring Diagram)
NO
Replace PCB
C
Fan connections correct at fan and PCB
1.
Connectors X11 & X23 See Wiring Diagram
YES
Is there 120V AC at fan terminals connector
X11 blue to brown. See Wiring Diagram
FAU LT SO LU T I O N SECT I O N S
NO
Check electrical supply
NO
Replace fuse
NO
Check wiring
NO
Replace PCB
120V between PCB -connector x13 pump
terminal Blue and PCB -connector x11 pump
terminal Black.
(See Wiring Diagram)
NO
Replace PCB
NO
Make connections
YES
Fan jammed of faulty winding
4 8
Connection OK at
connector x1 0
YES
Main or Display
Display
PCB fault
illuminated
120V at
Pump
NO
Check wiring
YES
Replace fan
PN 240012875 REV. D [ 03/ 15/ 2022]
Replace
Pump