Daikin Enfinity - I;O Expansion Module LED Faults and Remedy

www.DaikinApplied.com 45 LARGE VERTICAL WSHP IM 1059-12
troubleshooting
I/O expansion module LED faults and remedy
Table 30: Baseboard communication fail
Description Type Yellow Green Red
Baseboard Communication Fail Fault Flash OFF Flash
• 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 Type Yellow Green Red
Compressor #2 High Pressure Fault OFF OFF Flash
• 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 ow (cooling operation)
• Check airow (heating operation)
• Entering water and air temperatures should be within the operating limits
Table 32: Compressor #2 low pressure
Description Type Yellow Green Red
Compressor #2 Low Pressure Fault OFF OFF ON
• 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 Type Yellow Green Red
Compressor #2 Low Suction Temp Fault Flash OFF OFF
• Check water ow (heating operation)
• Check airow (cooling operation)
• Entering water and air temperatures should be within the operating limits.
Table 34: Compressor #2 low suction temp
Description Type Yellow Green Red
Compressor #2 Low Suction Temp Fault Flash OFF OFF
• Check water ow (heating operation)
• Check airow (cooling operation)
• Entering water and air temperatures should be within the operating limits.
Table 35: Compressor suction temp sensor fail
Description Type Yellow Green Red
Compressor Suction Temp Sensor
Fail
Fault Flash OFF OFF
• 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 Type Yellow Green Red
Entering Water Temp Sensor Fail
(Boilerless Electric Heat or Waterside
Economizer Only)
Fault ON OFF Flash
• Verify connections at terminals H4 on the I/O expansion board
• Verify resistance of EWT thermistor is 10K @ 77°F.