- Grind Master Corporation Coffee brewer OPERATIONS MANUAL INSTALLATION

HEATING PROBLEMS
Tank does not heat
• No electrical power to equipment.
• No power to control board.
• High electrode coated with lime or faulty.
• Connection from control board to tank body
faulty.
• Connections from control board to heater
relay faulty.
• Check for proper voltage at terminal block.
Check circuit breaker on supply circuit.
Establish electrical power to unit.
• Check for 120V across transformer primary
terminals by disconnecting the quick-connect
for the red and white wires to the transformer
and measuring voltage at this point. If there is
not 120V across primary, proceed to step
entitled “No power to control board and
transformer not powered”. If there is 120V
across primary, proceed to step entitled, “No
power to control board and transformer
powered”.
• Disconnect electrode wire at quick connect
(red wire). Connect a wire from the quick
connect to the cabinet body. If heating begins,
this is the error cause. Remove electrode
assembly and clean the probes. If problem is
not corrected, replace electrode assembly.
• Check to ensure connection (yellow wire) is
secure. Make connection to tank secure.
• Check to ensure connections (yellow and
orange wires) are secure. Make connections to
relay secure.
• Fill valve is faulty.
• Control board is faulty.
• Check to ensure proper connection between
connector CN4 and control board. Check for
proper connections at fill valve terminals.
Check for proper connections between N
terminal of fill valve and terminal block. Drain 1
gal. of water from hot water faucet. Check for
120Vac across fill valve terminals. If connector
CN4 is securely attached to control board and
all connections are secure and there is 120Vac
across fill valve terminals, replace
control board.
• Check to ensure proper connection between
connector CN4 and control board. Check for
proper connections at fill valve terminals.
Check for proper connections between N
terminal of fill valve and terminal block. Drain 1
gal. of water from hot water faucet. Check for
120Vac across fill valve terminals. If connector
CN4 is securely attached to control board and
all connections are secure and there is 120Vac
across fill valve terminals, replace control
board.
• Line voltage connections to heater relay faulty.
• Connection to remainder of heater circuit faulty.
• Heater relay faulty.
• Thermal cut-out tripped or faulty.
• Check to ensure connection (red and blue
wires) are secure. Make connection to relay
secure.
• Check to ensure connections from relay to
thermal cut-out and from thermal cut-out to
contactor and from contactor to N terminal of
terminal block are secure. Make connections
secure.
• Ensure that coil on heater relay is energized
by ensuring that there is 12Vac between the
yellow and orange wires attached to the relay.
Remove the blue and red wires from the relay
and check for an open circuit across the
connection tabs (COM and NC) to which the
wires were attached. If the relay coil is
energized and there is an open circuit across the
connection tabs, replace relay.
• 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 after resetting
thermal cut-out). Press button on thermal cut-out,
if open circuit condition continues, replace thermal
cut-out.
Tank does not refill (cont’d)
Problem Possible Cause Solution
TROUBLESHOOTING GUIDE (cont’d)
AMERICAN METAL WARE
®
BREWERS
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