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Table 12: Fault List (Part 4 of 4)
Faults
Zone Temperature Too Cold
Zone Temperature Too Hot
Table 13: Troubleshooting Details
Symptom
The controller displays Idle with a Unit
Status of Cooling Unavailable due to
OA Temp despite being above cooling
setpoint, or with a status of Heating
Unavailable due to OA Temp despite
being below the setpoint.
The controller displays Idle with a Unit
Status of Cooling Unavailable due to
Control Mode despite being above
cooling setpoint, or with a status of
Heating Unavailable due to Control
Mode despite being below the
setpoint.
The controller displays Idle with a Unit
Status of Cooling Unavailable
despite being above cooling setpoint,
or with a status of Heating
Unavailable despite being below the
setpoint.
The heat pump does not sequence
properly.
The heat pump heats when it should be
cooling, and cools when it should heat.
The staged equipment shuts off above
the cooling setpoint or below the
heating setpoint when the PID is
running on the TEC. If the unit is in On/
Off Control mode, this does not apply.
The staged equipment cycles too
rapidly or too slowly when the PID is
running on the TEC.
TEC3000 Series Wireless Single- or Two-Stage Economizer Thermostat Controllers Installation Instructions
Probable Causes
The Zone Temperature has decreased
below the configured Zone Temp Low
Limit.
The Zone Temperature has increased
above the configured Zone Temp High
Limit.
1
(Part 1 of 3)
Probable Causes
The outdoor air temperature is too
warm for heating or too cold for
cooling.
The Control Mode is set to Cooling
Mode, but the controller is requesting
heating.
The Control Mode is set to Heating
Mode, but the controller is requesting
cooling.
The Number of Compressors is set to
Not Used and the controller is
requesting cooling, or Number of
Heating Stages is set to Not Used.
The heat pump requires traditional
wiring (Y1, Y2, W1, W2, and G) and
handles the reversing valve internally,
but Heat Pump Supported is set to Yes.
The heat pump requires thermostat to
control the reversing valve (Y1, Y2,
O/B, and G) but the Heat Pump
Supported is set to No.
Reversing Valve polarity is incorrectly
set.
The PID control algorithm minimizes
overshoot and energy usage for the
particular equipment and zone, and
may cycle the equipment prior to
reaching setpoint.
The control band around the setpoint is
determined by the minimum on/off
times and is set incorrectly for the
equipment, zone, or user preference.
There is a tradeoff between reduced
control band size and increased
energy usage and equipment wear
from increased cycling.
Solutions
Verify that the TEC and the RTU heating are
enabled and functioning.
Verify that the TEC and the RTU cooling are
enabled and functioning.
Solutions
1. If Cooling and Heating Lockout
Setpoints are inadequate, adjust the
setpoints.
2. Wait for the outdoor conditions to be
favorable for heating or cooling.
Change the Control Mode to Auto or
Heating.
Change the Control Mode to Auto or
Cooling.
Adjust the number of compressors and
number of heating stages to match the
configuration of the unit.
Consult the equipment documentation to
verify wiring configuration, then set Heat
Pump Supported to No.
Consult the equipment documentation to
verify wiring configuration, then set Heat
Pump Supported to Yes.
Consult the equipment documentation to
verify reversing valve polarity, then adjust
the Reversing Valve Polarity menu option
accordingly.
Expected behavior.
1. Verify that equipment minimum on/off
times are set correctly.
2. If the default deadband around the
setpoint does not provide the desired
temperature control, set Temp
Control Setup to Deadband Override
and set the Deadband parameter to
the desired value.
42
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