Troubleshooting Chart 4 - UTICA BOILERS UCS 380 Installation, Operation And Maintenance Manual

Check water pressure. Is water
pressure at least 15 psig?
YES
Are any water valves
partially closed?
YES
Open all
Check wire harness against
valves
wiring diagram. Are Supply
sensor wires green and
Return Sensor wires red?
Check wire plugs are
securely connected to
sensors.
NO
YES
Check both sensors are
properly inserted into pipe
lines.
NO
YES
Refer to temperature
sensor chart
YES NO
Replace
Replace
control board
sensor
13 - TROUBLE SHOOTING

Troubleshooting Chart 4

E10, E11 - Temperature Difference Between
Supply and Return Too Great
E35 - Supply and Return Sensors Reversed
Is return line warmer than
supply line?
YES
NO
NO
NO
YES
Wire connections are
reversed. Correct
wiring connections.
Assure wire harness plugs
are securely connected to
sensors
Repair sensor insertion
into pipe lines
NO
Error Code is
accurate.
Correct system
Onboard pump operation
properly?
NO
YES
Possible air
in system.
De-aerate
78
piping.
Replace
pump
PN 240011662 Rev. K [01/31/2020]