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Troubleshooting
TsTbT4h2CP ThermosTaT series insTallaTion TroubleshooTinG
Problem
Display on thermostat
1
not illuminated
2
No Cooling
3
No Heating
4
No Heating or Cooling
Heating comes on
5
during a cooling call
with a heat pump
"Filter" is displayed
6
on the thermostat
"UV Bulb" is displayed
7
on the thermostat
"HumPad" is
8
displayed on the
thermostat
9
Fan will not turn off
The set point will not
10
go any higher or lower
Revised 06-13
Possible Explanation
Power is not available to
the thermostat
Thermostat Settings are
not correct
Thermostat Settings not
correct
Thermostat has locked
out compressor due to
minimum off time setting
The thermostat is not set
up correctly for a heat
pump.
The time duration for a
filter change has been
surpassed.
The time duration for a
UV bulb change has been
surpassed.
The time duration for a
Humidifier Pad change
has been surpassed.
Fan setting is set to ON
instead of AUTO
The set point limits have
been reached
Subject to change without prior notice
TSTBT4H2CP SERIES 17
Possible Solution
1. Verify the unit circuit breaker is not tripped.
2. Detach the thermostat from wall plate and verify that
all wires are connected on the base make sure the
thermostat is properly seated on the wall.
1. Verify that the thermostat mode is in "COOL ". If not,
push the SYSTEM button until "COOL " is displayed.
2. Verify the set point temperature is not higher than the
space temperature. If it is, use the (down) button to
adjust the set point to below the space temperature to
initiate a cooling call.
1. Verify that the thermostat mode is in "HEAT". If not,
push the SYSTEM button until "HEAT" is displayed.
2. Verify the set point temperature is not lower than
the space temperature. If not use the (up) button to
adjust the set point to above the space temperature to
initiate a heating call.
Once the space temperature matches the set point
temperature on the thermostat, the heating or cooling
call is removed and the equipment turns off. If the user
changes the set point temperature within the minimum
off time, the equipment will not come on. This is a
protection feature for the compressor and is normal.
Wait 10 min and verify if equipment has began operating
in heating or cooling mode. If unit remains off, call a
licensed technician.
Call a technician as the thermostat must be set up
correctly. There are many settings to be made and
should only be attempted by a trained technician.
Change the filter and reset the filter timer by pressing
the area of where "Filter" is displayed
Call a technician for UV Bulb maintenance.
Call a technician for Humidifier pad maintenance.
Press the FAN button to change the status to AUTO
There is a maximum temperature in heating that cannot
be surpassed and a minimum temperature in cooling
that cannot be surpassed. The technician who installed
the thermostat may have set these limits to protect
the equipment. The end user should not modify these
settings and should consult with a trained technician
who is familiar with the equipment being used.
6 720 220 380
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