OM 752-4
38 www.DaikinApplied.com
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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
Reset
Keypad/ display
fault codes
1
Space Temp Sensor Failure
Auto
f0
2
Not used
f1
3
Not used
f2
4
Not used
f3
5
Not used
f4
6
Not used
f5
7
Outdoor Temp Sensor Failure
Auto
f6
8
Discharge Air Temp Sensor Failure
Auto
f7
9
Not used
f8
10
Not used
f9
11
Space Humidity Sensor Failure
Auto
fa
12
Outdoor Humidity Sensor Failure
Auto
fb
13
Space CO2Sensor Failure
Auto
fc
14
Not Used
fd
15
Not Used
fe
16
Change Filter Indication
Manual
ff
17
EPROM Memory Indicator
Replace conroller board
ee
18
Configuration Display
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Summary of Contents for MicroTech II
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