TCS UbiquiSTAT US4050 Configuration Manual page 22

Configuration
Issue
Service status symbol is on
( icon is showing on display)
Outputs will not shut off
Analog outputs not working
Both heating and cooling are on • Faulty wiring
RS-485 network not recognized
No Wi-Fi connection detected
(WI-Fi models only)
22
Probable Cause(s)
• Indicates The UbiquiSTAT needs service in
one or more of the following conditions:
⸰ Fan proving failure
⸰ Filter needs changing
⸰ Discharge high
⸰ Discharge low
• Faulty wiring
• Setpoints set improperly
• Polarity of relay outputs are reversed
• Faulty wiring
• Improper programming
• UbiquiSTAT is being powered from the same
power source as actuators or motors.
• Improper operating mode is selected
• Faulty wiring
• Improper continuity across network
• Missing terminating resistor
• Incorrect SSID settings
• Signal strength too weak
• Incorrect network selected
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Solution
• When the DI is configured for fan proving, the
system will shut down if the fan is not
detected or is not functioning. Check the
fan to make sure it is operating correctly.
• Change the filter.
• Check Discharge Air High setting. When
the Discharge Air temperature exceeds
the high limit value, the heat control shuts
down until the condition no longer exists.
• Check Discharge Air Low setting. When
the Discharge temperature drops below
the low limit value, the cool control shuts
down until the condition no longer exists.
• Check wiring connections.
• Verify heating and cooling setpoints are
correct.
• Reset the UbiquiSTAT by touching and holding
the STATUS button for five seconds.
• Check wiring connections.
• Check programming.
• Power the UbiquiSTAT from a separate power
source.
• Check wiring connections.
• Check whether you have selected Heat Pump
mode or Conventional Heating mode.
• Check wiring connections.
• Make sure proper continuity is maintained: A
wires to A-ports, B wires to B-ports, etc.
• Check whether there is a terminating resistor at
the end of the network.
• Check Wi-Fi Network menu and verify settings.
• Test signal strength with separate device e.g.,
cell phone. Check Wi-Fi hub. If necessary,
contact your IT department for assistance.
• Select different network in Wi-Fi Configuration
settings.