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13 - TROUBLE SHOOTING
Error shows when safety circuit is
open. Remove J13 connector from
control module. Check for continuity
between two pins connected to two
pink wires, is continuity available?
YES
NO
Replace Control Module
Boiler red without enough water ow
through heat exchanger. Heat exchanger
is over heated. Either high limit or heat
exchanger temperature switch is open.
Check the following:
• Air in system?
• Verify water ow in system piping
• Flush system if water is dirty.
Is boiler supply pipe (above
heat exchanger) hot?
Wait for boiler to
cool down.
YES
NO
Replace Broken Switch
Unplug molex connector on supply
temperature sensor. Check continuity
between two pins on sensor (two
pins connected to two pink wires) .
Is continuity available?
YES NO
Check for loose connections
on two pink wires on J13
connector, supply sensor, and
safety temperature switch.
YES
NO
Fix Loose Connections Replace Wire Harness
Let all zones
run until water
temperature
drops.
Is Heat Exchanger surface
hot?
YES
NO
Check high limit
and surface
temperature
switches
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