DB7110U UNIVERSAL HEAT PUMP DEFROST CONTROLLER
11 34-00032—01
Table 7. Sensor Diagnostics.
Table 6. Fault Code Information.
Fault No. Description Corrective Action
1 Internal Communication Fault • Replace control
2 Internal Fault • Replace control
3 Low 24V • Measure 24V (R & C). There may be something in the
system loading the 24V transformer excessively. If voltage
is normal while the fault is currently active, replace the
control.
4 Corrupt Memory • Reset configuration options. Replace the control if the fault
persists.
5High Pressure Lockout – HPC
opened 3 times on a single
request.
• Investigate refrigerant charge
• Check indoor coil for blockage
• Check outdoor coil for blockage
6 Low Pressure Lockout – LPC
opened 3 times on a single
request.
• Investigate refrigerant charge
7 High Pressure Cutout is currently
open
• Investigate refrigerant charge
• Check indoor coil for blockage
• Check outdoor coil for blockage
8 Low Pressure Cutout is currently
open
• Investigate refrigerant charge
9 Coil Sensor Open Circuited • Check the sensor hasn’t become unplugged.
• Check sensor wiring
•Replace sensor
10 Coil Sensor Shorted • Check for pinched wires
•Replace sensor
11 Air Sensor Open Circuited • Check the sensor hasn’t become unplugged.
• Check sensor wiring
•Replace sensor
Note that this fault will only present itself if the sensor opens
after it has been detected. It will be cleared on a reset or power
cycle. Running without an air sensor causes the control to
operate in a timed defrost mode, which may be desired
operation.
12 Air Sensor Shorted • Check for pinched wires
•Replace sensor
Display Description
Air sensor open circuit or unplugged
Air sensor shorted
Coil sensor open circuit or unplugged
Coil sensor shorted
C
M37658
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