heat-timer Mini-Extension Installation And Operations page 27

START
The control is in DHW
Priority and is
NO
providing all output to
domestic water.
Check SHUTDOWN or
YES
PROVE signal source.
Mini-MOD & Mini-Extension Installation Manual
TROUBLESHOOT - NO HEAT
Does the control have
power?
YES
Is the control in
SUMMER mode?
NO
Is the SYSTEM
Relay AND any of the
Boiler Output Relay
lights ON?
NO
Is the SYSTEM Relay
light ON?
YES
Is the control
display indicates a
SHUTDOWN or PROVE
status?
NO
Is any of the
System or Outdoor
Sensors Short or Open?
YES
Replace the faulty
sensor.
Turn control power
NO
ON.
Select WINTER from
YES
the Season menu.
Does the
YES Output relays that are
ON have continuity?
NO
Contact Factory for
control troubleshoot.
Is the Outdoor
sensor reading above
NO
the Outdoor Cutoff
setting?
YES
Either change the
Outdoor Cutoff setting
or wait for the
Outdoor temperature
to drop below that
setting.
Check the wiring
from control to the
boilers and the
YES
pump.
Check plumbing for
heat distribution.
Check control heat
settings for proper
NO
heating Reset Ratio or
Set Point.
27