MP-3000 Controller
113
13** Evaporator Fan High Speed Current Too Low
(Check Alarm)
• Occurs during pre-trip (PTI), function test or probe
test.
• When the evaporator fan power consumption is
25% below expected current draw (below 1.6 to 2.4
amps, depending on voltage).
• Indicates:
• Defective evaporator fan motor relay
• Defective or open fan motor internal over
temperature protection switch
• Defective volt or amp meter on relay board
• Incorrect motor or motor connections
• Open evaporator door and make sure all fans
rotate freely.
• Enter Manual Function Test and start
evaporator fans on high speed. Make sure all
fans start on high speed. If a motor does not
start and is very hot, wait 10 minutes for
internal over temperature switch to close.
• Check fan motor volts and amps.
• Check volt and ampere meter.
14** Evaporator Fan Low Speed Current Too High
(Check Alarm)
• Occurs during pre-trip (PTI) or function test only.
• Evaporator fan power consumption is 25% above
expected current draw (above 1.0 to 2.0 amps,
depending on voltage).
• Indicates:
• Defective or stuck evaporator fan motor
• Incorrect motor or motor connections
• Motor high and low speed connection are
interchanged
• Defective volt or amp meter on relay board
• Open evaporator door and make sure all fans
rotate freely.
• Enter Manual Function Test and start
evaporator fans on Low speed. Make sure all
fans start on low speed. Check fan motor volts
and amps.
• Check volt and ampere meter.
15** Evaporator Fan Low Speed Current Too Low
(Check Alarm)
• Occurs during pre-trip (PTI) or function test only.
• When the evaporator fan power consumption is
25% below expected current draw (below 0.6 to 1.2
amps, depending on voltage).
• Indicates:
• Defective evaporator fan motor relay
• Defective or open fan motor internal over
temperature protection switch
• Defective volt or amp meter on relay board
• Incorrect motor or motor connections
• Open evaporator door and make sure all fans
rotate freely.
• Enter Manual Function Test and start
evaporator fans on low speed. Make sure all
fans start on low speed. If a motor does not
start and is very hot, wait 10 minutes for
internal over temperature switch to close.
• Check fan motor volts and amps.
• Check volt and ampere meter.
**If both alarms 12 and 13; or 14 and 15 are activated, the alarms are caused by a large difference in measured amps. Enter
Manual Function Test menu and operate evaporator fans on low and high speed. Check the evaporator fan amps measure-
ment. If necessary, check the resistance in the motors: High speed between EF11 and EF12, EF12 and EF13, and EF11 and
EF13; Low speed between EF1 and EF2, EF2 and EF3, and EF1 and EF3. Resistance readings should be equal: High speed
about 6 Ohms, total of 2 motors; Low speed about 20 Ohms, total of 2 motors.
Alarm Codes, Descriptions and Corrective Actions (Continued)
Code Description Corrective Action
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