Page 20
Shuttle Brewers & Airpot/Shuttle Brewers
Troubleshooting (cont.)
Heating Problems
Problem
Possible Causes
Service Check
Remedy
Tank does not heat
• Low (long) electrode
coated with lime or
faulty.
• Connection from
control board to tank
body faulty.
• Connections from
control board to heater
relay faulty.
• Line voltage connections
to heater relay faulty.
• Connections to
remainder of heater
circuit faulty.
• Heater relay faulty.
• Thermal cut-out tripped
or faulty.
• Disconnect electrode
wire at quick connect
(purple wire). Connect a
wire from the quick con-
nect to the cabinet body.
If heating begins, this is
the error cause.
• Check to ensure
connection (green wire)
is secure.
• Check to ensure
connections (gray and
blue wires) are secure.
• Check to ensure
connections (black and
brown wires) are secure.
• Check to ensure
connections from relay
to thermal cut-out and
from thermal cut-out to
contactor and from
contactor to proper ter-
minal of terminal block
are secure. See wiring
diagram for more info-
mation.
• Ensure that coil on
heater relay is energized
by ensuring that there is
24 VDC between the
gray and blue wires
attached to the relay.
Remove the black and
brown wires from the
relay and check for an
open circuit across the
connection tabs (COM
and NO) to which the
wires were attached.
• Check for open circuit
on thermal cut-out.
(NOTE: Tripping of
thermal cut-out can
indicate presence of
another problem with
the unit. Unit should
be monitored)
• Remove electrode assembly
and clean the probes. If
problem is not corrected,
replace electrode assembly.
• Make connection to
tank secure.
• Make connections to
relay secure.
• Make connections to
relay secure.
• Make connections secure.
• If the relay coil is energized
and there is an open circuit
across the connection tabs,
replace relay.
• Replace thermal
cut-out.
