I/O Expansion Module Led Faults And Remedy - Daikin Enfinity Installation And Maintenance Manual

I/O expansion module LED faults and remedy

Table 30: Baseboard communication fail
Description
Baseboard Communication Fail
• Verify jumper JP8 on main board is shorted.
• Verify connection of cable between H5 on main board and H1 on I/O expansion board.
Table 31: Compressor #2 high pressure
Description
Compressor #2 High Pressure
• Verify high pressure switch is connected to terminal HP2 on the I/O expansion.
• Check for continuity of the high pressure switch.
If the high pressure fault resets when power is recycled:
• Check water flow (cooling operation)
• Check airflow (heating operation)
• Entering water and air temperatures should be within the operating limits
Table 32: Compressor #2 low pressure
Description
Compressor #2 Low Pressure
• Loose wire connection on low pressure circuit
• Failed low pressure switch
• Circuit #2 is low on charge
Table 33: Compressor #2 low suction temp
Description
Compressor #2 Low Suction Temp
• Check water flow (heating operation)
• Check airflow (cooling operation)
• Entering water and air temperatures should be within the operating limits.
Table 34: Compressor #2 low suction temp
Description
Compressor #2 Low Suction Temp
• Check water flow (heating operation)
• Check airflow (cooling operation)
• Entering water and air temperatures should be within the operating limits.
Table 35: Compressor suction temp sensor fail
Description
Compressor Suction Temp Sensor
Fail
• Check connection of low suction temperature sensor on terminal H7 pins 1 and 2.
• Check resistance of low suction temperature sensor. All sensors are 10kohm thermistor @77°F.
Table 36: Entering water temp sensor fail (boilerless electric heat or waterside economizer only)
Description
Entering Water Temp Sensor Fail
(Boilerless Electric Heat or Waterside
Economizer Only)
• Verify connections at terminals H4 on the I/O expansion board
• Verify resistance of EWT thermistor is 10K @ 77°F.
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