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Fault No.
1
Internal Communication Fault
2
Internal Fault
3
Low 24V
4
Corrupt Memory
5
High Pressure Lockout – HPC
opened 3 times on a single
request.
6
Low Pressure Lockout – LPC
opened 3 times on a single
request.
7
High Pressure Cutout is currently
open
8
Low Pressure Cutout is currently
open
9
Coil Sensor Open Circuited
10
Coil Sensor Shorted
11
Air Sensor Open Circuited
12
Air Sensor Shorted
Display
Air sensor open circuit or unplugged
−−
A
M37655
Air sensor shorted
__
A
M37656
Coil sensor open circuit or unplugged
−−
C
M37657
Coil sensor shorted
__
C
M37658
The product should not be disposed of with other household waste. Check for the nearest authorized collection
centers or authorized recyclers. The correct disposal of end-of-life equipment will help prevent potential
negative consequences for the environment and human health.
Table 6. Fault Code Information.
Description
Table 7. Sensor Diagnostics.
DB7110U UNIVERSAL HEAT PUMP DEFROST CONTROLLER
Corrective Action
• Replace control
• Replace control
• 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.
• Reset configuration options. Replace the control if the fault
persists.
• Investigate refrigerant charge
• Check indoor coil for blockage
• Check outdoor coil for blockage
• Investigate refrigerant charge
• Investigate refrigerant charge
• Check indoor coil for blockage
• Check outdoor coil for blockage
• Investigate refrigerant charge
• Check the sensor hasn't become unplugged.
• Check sensor wiring
• Replace sensor
• Check for pinched wires
• Replace sensor
• 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.
• Check for pinched wires
• Replace sensor
Description
11
34-00032EF—01
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