TemperZone TTS-10 Troubleshooting Manual

TTS-10 Wall Thermostat
Troubleshooting Guide

GENERAL

Troubleshooting is already documented in the
This additional Troubleshooting Guide assumes power is on to the TTS-10 Wall Thermostat
and the on/off light is showing, that the control is not in a 'Timed Off' condition or in a 'Sleep'
mode, and is set to 'Auto', 'Cool' or 'Heat' mode.
SYMPTOMS & SOLUTIONS
Fails to become live when power applied (or dies seconds after startup)
Check 230 volt power (Red wire) is on 'L' terminal of the Controller board (located in the
Indoor Unit) and Neutral (Black wire) is connected on 'N' terminal.
Check interconnecting wiring connection at Wall Display/Sensor board. The wires are most
likely transposed.
Correct wiring is:- White to TX/RC terminal, Black to GRD and Red to +5V.
Compressor stops seconds after initial startup on heating mode or fails to start
May be failing on HP switch or on high indoor coil temperature protection.
Check indoor coil sensor is correctly inserted in sensor pocket and is surrounded by heat
transfer paste to ensure good temperature conductance. Poor contact would result in the
indoor fan starting late and the compressor failing on HP.
Check indoor coil sensor does not have broken wire, ie open circuit. Indoor fan should default
to low speed and compressor should not start at all.
Check indoor coil sensor is not bridged/short circuited. Indoor fan should default to low speed
and compressor should not start at all.
Check indoor coil sensor is not sensing a high indoor coil temperature (67°C), if compressor
starts and this occurs (fan motor failure or poor air flow) compressor signal is locked out and
the controller must be switched off and on to reset.
Check Wall Display/Sensor is not located such that air from a supply grille is blowing directly
or indirectly onto it. This may cause major swing of temperature at the sensor and change of
cycle from heat to cool, indoor fan stopping and long delay before restart.
Display of 'LO' or 'HI'
Room temperature out of range, ie below 8°C or above 40°C. Controller should still operate
normally and as temperature becomes closer to set point will start displaying correctly.
TTS-10 User's Operating Instructions
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