OWNER’S MANUAL
MODEL HT18 AUTOTOAST™ HORIZONTAL TOASTER
144328 RV082813 5
Copyright 2013 Marshall Air Systems, Inc.
All Rights Reserved.
a temperature error of the right platens. “AL3” and “AL4” alarms will turn unit off requiring a
service call.
D. If push button is on side panel, check two wires to make sure they are tight.
QUALIFIED SERVICE TECHNICIAN CHECK:
A. Check that there is power at receptacle. Verify voltage is correct based upon the voltage listed
on the toaster nameplate.
B. WITH UNIT UNPLUGGED, check connections inside of plug. Remove right side panel and
check wiring. Any wires or terminals with burns or discoloration from arcing should be replaced.
All wiring, if replaced, should be same or higher rated wire.
C. Check sensors to see if OHM readings are correct. At room temperature (70°F), should be
nominal 1.09K ohms. (NOTE: A defective sensor will not allow toaster to power on, but error
messages are not visible if toaster is equipped with push button.)
D. With toaster off, check for continuity across the solid state relay terminals #1 and #2. Normal
readings are in mega ohm range. If reading ohms, relay has failed closed and will not cycle.
E. Control Generation 2 if no LED on display, check for .5 amp transformer fuses. If fuses good,
check for 208 volts on terminals 1 and 6, then 18 Vac on 11 and 12. If 208 volts is present and
no 18 Vac output, replace transformer.
2. PROBLEM: Conveyor belts move but no heat.
SOLUTION:
QUALIFIED TECHNICIAN CHECK:
A. Check that there is power at receptacle. Verify voltage is correct based upon the voltage listed
on the toaster nameplate.
B. Check for loose connections at terminal strip and temperature terminals (see schematic).
C. Verify that the heater and sensor wires are connected to the controller.
D. Replace all connections or components that have damaged terminals. Replace any damaged
wiring with same or higher rated wire.
E. Check the resistance of the sensor(s). If sensor is open, replace. At room temperature (70°F),
Ohms should be nominal 1.09K ohms.
F. Check voltage into solid-state relays. The voltage input from module should be approximately
5Vdc. Voltage to heater should be 208 or 240Vac.
G. Check the resistance of the heater platens: 24 ohms at room temperature
H. Control Generation 2 – Check for 24Vdc to the heater relay (R1, R2) from the control board. If
getting 24Vdc from the control board, check for 208 volts on output side of relay. If no 208 volts
then replace relay. If there is 208 volts, then possible solid state relay problem.
3. PROBLEM: Heater platens are hot, control says LO or RDY, conveyor belts do not move.
SOLUTION:
OPERATOR CHECK:
A. Make sure carriage is pushed completely in and latch is engaged.
B. Remove conveyor carriage and turn conveyors by hand and determine there is no binding due to
dropping carriage.
