OM 1280-2 • MICROTECH UNIT CONTROLLER 53 www.DaikinApplied.com
Alarm and Fault Monitoring
The most important aspect of troubleshooting unit ventilator
controls is to isolate the source of the problem into one of two
categories:
1. The problem resides within the UVC (hardware or
software).
2. The problem is external to the UVC. Under most
circumstances the problem is external to the UVC.
conditions.
Alarm Types:
• Auto: Alarm clears automatically when the condition
clears
• 2-Auto in 7 Days then Manual: Alarm clears
automatically unless the alarm has occurred 3 or more
times within 7 days; in that case the alarm must be
cleared manually
• Manual: The alarm must be cleared manually
If an alarm condition exists, a fault occurs. When a fault exists,
the following occurs:
• The UVC indicates the fault condition by displaying the
fault code on the optional keypad/display
• The remote wall-mounted sensor (optional) Status
exists
• The fault signal binary output energizes
• The fault performs the appropriate control actions as
described for each fault
Manual reset faults can be reset in one of four ways:
• By cycling the unit power
• Via the keypad/display menu
• Via the network interface
• Via an input from a remote mounted space sensor
Table 25: Alarm and Fault Code Summary
Alarm
Number
Name Type Priority Label Reset
MultComp
Alarm
1 ShutdownDIAlarm Fault 3 Shutdown Discrete Input Fault Auto
2 SpaceTempSensorAlarm Problem 8 Space Temp Sensor Failure Auto
3 HighDxPressureAlarm Problem 9 High DX Pressure Fault
2-Auto in 7-days
then manual
X
4 DATLLDxAlarm Problem 10 Discharge Air DX Low Limit Violation Auto
5 Problem 11 Auto
6 IndoorAirCoilDxTempSensorAlarm Problem 12 Indoor Air Coil Dx Temp Sensor Failure Auto X
7 OATSensorAlarm Fault 4 Outdoor Air Temp Sensor Failure Auto
8 DATSensorAlarm Fault 5 Discharge Air Temp Sensor Failure Auto
9 OutdoorAirCoilDxTempSensorAlarm Problem 13 Outdoor Air Coil DX Temp Sensor Failure Auto X
10 WaterCoilDxTempSensorAlarm Problem 14 Water Coil DX Temp Sensor Failure Auto X
11 WaterOutTempSensorAlarm Problem 15 Water-out Temp Sensor Failure Auto
12 WaterInTempSensorAlarm Problem 16 Water-in Temp Sensor Failure Auto
13 SpaceHumiditySensorAlarm Problem 17 Space Humidity Sensor Failure Auto
14 OutdoorHumiditySensorAlarm Problem 18 Outdoor Humidity Sensor Failure Auto
15 SpaceCO
2
SensorAlarm Problem 19 Space CO
2
Sensor Failure Auto
16 WaterInTempInadequateAlarm Problem 20
Source Temp (Water-in)
Inadequate Indication
Auto
17 WaterCoilFreezeAlarm Problem 21 Hydronic Water Coil Freeze Stat Auto
18 LowSuctionLineTempAlarm Problem 22 Low Suction Line Temp Failure
2-Auto in 7-days
then manual
19 CantCoolAlarm Problem 23 Can’t Cool Auto
20 CantHeatAlarm Problem 24 Can’t Heat Auto
21 DATLLAlarm Problem 25 DAT Low Limit Auto
22 BrownoutAlarm Problem 26 Brownout Problem Auto X
23 HighVoltageAlarm Problem 27 High Voltage Problem Auto X
24 ChangeFilterAlarm Warning 32 Change Filter Indication Manual
25 LowOACoilTempAlarm Problem 28 Low Outside Air Coil Temp Auto
26 ReturnTempSensorAlarm Problem 29 Return Temp Sensor Failure Auto
27 Fault 6 Manual
28 ControlTempAlarm Fault 7 Control Temp Not Available Manual X
29 Warning 30 Auto
30 ControlBoardAlarm Fault 2 Control Board Hardware Failure Auto
31 WaterCoilFreezeFaultAlarm Fault 7 Hydronic Water Coil Freeze Fault Auto
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