Heat Controller BHD-301-G Service Manual page 15

Heat Controller, Inc.
Complaint
Fan motor noise
Compressor fan motor runs
only
Insufficient capacity
The compressor does not stop
even if the room humidity has
reached the set RH%.
The unit starts and stops
frequently.
Portable Dehumidifier with R-410A
Cause
Fan
Blower
Loose screws
Worn bearings
Voltage
Wiring
Main PCB failure
Capacitor (Discharge
capacitor before testing)
Humidity sensor
Compressor
Air filter
Condenser and
Evaporator
Fan motor
Room structure
Air flow
Less refrigerant
Capillary tube
Compressor
Humidity sensor
Main PCB
Power supply
Humidity sensor
Main PCB
Remedy
Replace the fan if cracked, out of balance, or partially
missing.
Replace the blower if cracked, out of balance, or partially
missing.
Tighten them.
Replace the motor if knocking sounds continues when
running, or if the motor hums or noise appears to be internal
while running.
Check voltage. Call an electrician if not within limits.
Check the wire connections, if loose, repair or replace
the terminal. If wires are off, refer to wiring diagram for
identification, and replace. Check wire locations. If not per
wiring diagram, correct.
Replace the main PCB.
Check the capacitor. Replace if not within 10% of
manufacturer's rating. Replace if shorted, open, or damaged.
Replace if shorted, open, or damaged.
Check the compressor for open circuit or ground. If open or
grounded, replace the compressor.
Clean if restricted.
Clean if restricted.
Check the fan capacitor and replace if not within 10% of
manufacturer's rating.
Ensure that the room the unit is operating in is sealed well.
Close any open doors or windows.
Clean or remove any barrier that blocks the inlet/outlet air
flow of the unit.
Check the lines for leakage. Recycle the refrigerant, correct
the leakage points and recharge.
Regulate the flow of capillary tube and make the evaporating
temperature appropriate if the evaporator is frosted.
The inlet and outlet valve of the compressor is damaged,
making the low pressure connected with the high pressure.
The refrigerating system is difficult to produce high pressure
and low pressure. Replace the compressor after checking
for the failure.
Check and replace if the Humidity sensor, if open or
damaged.
Check and replace the main PCB
The input power supply voltage is too low. Call an electrician
if not within limits.
Check and replace if the Humidity sensor, if open or
damaged.
Check and replace the main PCB.
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BHD-G Service Manual