Daikin Enfinity CCH - Page 39

www.DaikinApplied.com 39 IM 1049-9
troubleshooting
I/O Expansion Module LED Faults (For units with optional boilerless electric heat) (continued)
Table 26: High Pressure Circuit #2
Description Type Yellow Green Red
High Pressure Circuit #2 Fault OFF OFF Flash
• Verify high pressure switch is connected to terminal H6 on the I/O Expansion board
• 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 27: Low Pressure Circuit #2
Description Type Yellow Green Red
Low Pressure Circuit #2 Fault OFF OFF ON
• Loose wire connection on low pressure circuit
• Failed low pressure switch
• Unit is low on charge
Table 28: Low Suction Temp #2
Description Type Yellow Green Red
Low Suction Temp #2 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 29: Compressor Suction Temp Sensor Fail circuit #2
Description Type Yellow Green Red
Compressor Suction Temp Sensor
Fail circuit #2
Fault Flash Flash ON
• Check connection of low suction temperature sensor
• Check resistance of low suction temperature sensor, leaving water temperature sensor, and room sensor or return air sensor. All sensors are
10kohm thermistor @77°F