TemperZone TZT-100, User Manual, Page: 20 / 24

Symptom Suspected Fault Suggested remedy
E.Heating is shown on LCD
without manually
selecting it.
This is not a fault.
Your installer has set your TZT-100 to
automatically use “Emergency / Auxiliary
Heating” if the outside air temperature is very
low.
Some buttons do not
appear to operate.
Padlock is show on LCD. Key board lock is on.
See page 28 for more information on this
function. This is not a fault. Buttons or functions may
be locked to prevent unauthorised
tampering
Cannot enter “Heat” or
“Cool” modes.
Thermostat set for “Heat - only” or “Cool - only”
modes
Heating or Cooling mode not available on
your air conditioning system.
I cannot set my desired
heating or cooling set
temperature.
Padlock Symbol is flashing This is not a fault.
Your installer has set control limits for the
Heating and or Cooling set temperature.
Contact your installer and request these
limits to be removed / adjusted.
Outside Air Temp display
is showing dashes Outside air temperature air sensor has failed. Check wiring and outside air sensor.
Replace outside air sensor
No outside air sensor fitted. Installer has set “TT” terminal function
incorrectly – Call for service.
“Heat” or “Cool” is
flashing in the LCD.
Heating or cooling has not
started. This is not a fault. Heating or cooling will start
shortly.
The TZT-100 is performing an Anti Rapid Cycle
delay to conserve energy and to protect the
heating, cooling or heat pump system.
The Fan runs on for some
time after the heating or
cooling stops, even when I
turn the thermostat OFF. This is not a fault. (“Fan On” will be flashing)
The is fitted with a “Fan Purge” function that
keeps the fan running for a minimum amount
of time after the heating or cooling has
stopped.
Contact the installer if you wish this function
disabled (NOT recommended).
Temperature display in
the wrong format
– C or F.
The TZT-100 can operate in either Deg C or
Deg F mode. This is set by your installer. Contact your installer, Smart Temp or Oasis
for information on changing
your display type.