Troubleshooting; Service Diagnosis - Carrier 38VMH-1P Service Manual

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TROUBLESHOOTING

Service Diagnosis

If one of the following errors have occurred, contact local distributor for assistance.
• The error lamp of the outdoor unit flashing rapidly even though shut down and restart of the system is carried out.
• The remote controller displays error codes or the buttons on the controller do not work.
• The safety fuse blows frequently or the circuit breaker trips frequently.
• Obstacles and water enter the unit.
• Water leaks from indoor unit.
If system does not operate properly besides cases or malfunctions mentioned above, use the following procedure to check system.
Symptoms
Unit will not start
Fan operates, no cooling or
heating
Unit starts or stops frequently
No cooling effect
No heating effect
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
Table 34 —Troubleshooting Procedures
Causes
• Power supply failure
• Power switch is off
• Fuse burned out
• Temperature is not set correctly
• Time delay in compressor operation
• Incorrect refrigerant charge
• Air or other gas in the refrigerant circuit
• Improper voltage
• Heat exchanger of ODU or IDU is dirty or blocked
• Air filter of indoor unit is dirty
• Outdoor temperature is too high
• Lack of refrigerant
• Lack of refrigerant
• Recover the power supply
• Switch on the power
• Replace the fuse
• Set the temperature correctly
• Wait for at least three minutes for compressor to come back
on
• Check for leaks and refrigerant charge
• Vacuum and recharge refrigerant
• Voltage measured between L1 and L2 should be 187 to 253
volts
• Clean the heat exchanger and eliminate any obstacles
• Clean or replace the air filter
• Normal control
• Check for leaks and refrigerant charge
• Check for leaks and refrigerant charge
32
Solution