Troubleshooting Chart 3 - UTICA BOILERS UCS 380 Installation, Operation And Maintenance Manual

Is external
High Limit Switch off?
YES
Reset Switch
Check Boiler Pump
OK?
NO
YES
Water Circulation
Adequate?
YES NO
Purge air
Repair
in system
Piping
13 - TROUBLE SHOOTING

Troubleshooting Chart 3

E12 - High Temperature
Is High Limit Jumper Plug in
Place?
YES
NO or N/A
Check switches 4 and
5 in wire diagram. Both
electrical connected and
continuity?
YES
Does heat
exchanger switch 6
(in wire diagram)
have continuity?
YES
Replace Replace Heat
Pump
Exchanger
77
NO
Re-install
plug
NO
Repair plug or
replace switch
NO
PN 240011662 Rev. K [01/31/2020]