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75
Is High Limit Jumper Plug in
Place?
NO
YES
Replace
Pump
Check switches 4 and
5 in wire diagram. Both
electrical connected and
continuity?
NO
YES
Re-install
plug
Replace Heat
Exchanger
E12 - High Temperature
Is external
High Limit Switch off?
NO or N/A
YES
13 - TROUBLE SHOOTING
Troubleshooting Chart 3
Reset Switch
Check Boiler Pump
OK?
NO
YES
Water Circulation
Adequate?
NO
YES
Purge air
in system
Repair
Piping
Repair plug or
replace switch
Does heat
exchanger switch 6
(in wire diagram)
have continuity?
NO
YES
PN 240011664, Rev. L [11/01/2020]