Midmark M11 - Page 70

English-70
004-1032-00
TP210 Rev. A
© 2012 Midmark Corp. | 60 Vista Drive Versailles, OH 45380 USA | 1-800-643-6275 | 1-937-526-3662 |
[Revised: 8/15/17]
Troubleshooting Chart - continued
Problem Display / Symptom Cause Check Action
Error Code:
C987
C987: DRY MODE
HI-LIMIT OPEN
UNPLUG / REPLUG UNIT
High-limit thermostat opened for at
least 0.25 seconds during DRY mode.
High Limit Thermostats open. Verify if unit still overheated. Unplug unit for 60 seconds, then plug
unit into a dedicated, properly rated circuit.
Allow unit to cool for 30 minutes.
Temperature sensor malfunctioning. Check for residue build up on temperature
sensor probe.
Clean sensor probe with Speed-Clean,
distilled water, and abrasive pad.
Check that nothing is touching or crowding
the temperature sensor.
(Example: trays, pouches, cassettes, etc.)
Reposition items so nothing touches or
crowds the temperature sensor.
Perform Temperature Sensor
Resistance Test. Allow sensor to cool to
room temperature before testing.
Acceptable range 1.07-1.1K Ω.
Refer to:
Temperature Sensor Resistance Test
Replace temperature sensor.
Perform Temperature Sensor Supply
Voltage Test. Disconnect sensor
harness from J12 on PC board.
On pins 1 & 2 acceptable range is
4.0 - 6.0 VDC. Refer to:
Temperature Sensor Supply Voltage Test
Replace Main PC board.
Hi Limit thermostat malfunctioning.
If error code does not reset…
Perform: Thermostat Continuity Test
Meter Reading - Anything but OL
Replace thermostats.
Loose / Damaged wire connection. Check wire connections at high-limit
thermostat and at J5 on Main PC
board.
Secure / Repair loose or damaged wire
connections.
Door spring missing / damaged. If the door motor releases the latch,
but the door remains closed, Inspect
door spring for damage.
Replace door springs.
Verify if door is at the vented position.
(Push in on door with out lifting handle)
Verify the QTY of door springs.
(M11- QTY 2, M9-QTY 1)
Verify door springs are at a 45 degree angle. Place door spring at a 45 degree angle.
Door hinge binding. Check for binding or build up of debris
in the door hinges.
Clean debris from hinges.
Facility voltage too high / low. Test facility supply voltage.
Voltage must be...
115V models: 104 - 127 VAC 50/60 Hz
230V models: 207 - 253 VAC 50/60 Hz
Contact an electrician to modify
voltage.
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