Diagnostics And Service; Alarm And Fault Monitoring - Daikin MicroTech II Operation And Maintenance Manual

OM 752-4
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.
2. The problem is external to the UVC. Under most circumstances the problem is
external to the UVC.

Alarm and Fault Monitoring

The UVC is programmed to monitor the unit for specific alarm conditions. 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 keypad/
display.
• The remote wall-mounted sensor (optional) LED flashes a pattern indicating that a
fault condition 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 three ways:
• By cycling the unit power.
• Via the keypad/display menu.
• Via the network interface.
Table 21: Alarm and fault code summary
Priority Fault description
Space Temp Sensor Failure
1
Not used
2
Not used
3
Not used
4
5 Not used
6 Not used
Outdoor Temp Sensor Failure
7
Discharge Air Temp Sensor Failure
8
Not used
9
Not used
10
Space Humidity Sensor Failure
11
12 Outdoor Humidity Sensor Failure
13 Space CO2Sensor Failure
Not Used
14
Not Used
15
Change Filter Indication
16
EPROM Memory Indicator
17
Configuration Display
18
Replace conroller board
Download file
38
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IaGnostICs and
Keypad/ display
Reset
fault codes
Auto
f0
f1
f2
f3
f4
f5
Auto
f6
Auto
f7
f8
f9
Auto
fa
Auto
fb
Auto
fc
fd
fe
Manual
ff
ee
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