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AE8-1376 R5
Display
Fans not running on a fan cycling
unit and the fan lights are not on
Fans not running on a fan cycling
unit and the fan lights are on
Controller flashes "HP" at power-
up
Controller flashes "HP" or "HPL"
Controller flashes "DLT" or "DLL"
Controller flashing "HPL" or "DLL"
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or implied, regarding the products or services described herein or their use or applicability. Emerson Climate Technologies, Inc. and/or its affiliates
(collectively "Emerson"), as applicable, reserve the right to modify the design or specifications of such products at any time without notice. Emerson does
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Application Engineering
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Troubleshooting Guide (continued)
Likely Causes
• Condensing temperature is currently
below the fan cut-in
• Condensing temperature sensor not
properly installed – check installation
• Power cable harness not plugged in
properly or securely into the back of the
controller – check connections
• Jumper cable not plugged in properly or
securely into the back of the controller –
check connections
• High pressure switch is seeing above the
cut-out pressure
• For a replacing an -00 controller, ensure
that the jumper cable is the latest
revision. It should have a blue wire in
the harness. See Section 8.5 for more
details.
• System operation causing high discharge
pressures, check system operations
• System operation causing high discharge
line temperatures, check system
operations
• System operation causing high discharge
pressures (HPL) or high discharge line
temperatures (DLL) repeatedly, check
system operations
• To clear an HPL or DLL lockout, hold the
Start button for 3 seconds 2 consecutive
times, or cycle power to the unit. If using
the reset button, the alarm condition will
have to clear (DLT temperature drops or
Hp switch resets) and any minimum off
time will need to complete (5 minutes for
the fixed Hp switch).
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Other Possible Causes
• Transducer cable miswired – inspect cable,
replace if needed.
• Faulty temperature sensor – check
condenser temperature sensor resistance
values against table in Section 9.
• Power cable miswired – inspect cable,
replace if needed.
• Electrical assembly miswired – trace wiring
diagrams.
• Jumper cable miswired – inspect cable;
replace if needed.
• Faulty fixed Hp switch – inspect switch;
replace if needed.
• Bad high pressure switch – verify system
pressure when the pressure switch trips.
• See Section 7.2 for more details.
• Faulty temperature sensor – check DLT
sensor values against table in Section 9.
• See Section 7.1 for more details
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May 2016
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