background image

8

PROBLEM

POSSIBLE CAUSE

SOLUTION

The digital display does not 

light up. 

1. No power to the stat or sys-

tem equipment. 

2. Lightstat switch in OFF 

position. 

1. Check the system low   

voltage power. 

2. Check the system ON/OFF 

switch. 

3. Check the circuit breaker.

The display works but the 

heat does not come on. 

The room temperature 

is above the factory pro-

grammed limit of the thermo-

stat.  

Check again when the room 

temperature falls below the 

factory programmed limit.  

The display works but the 

cooling does not come on. 

(some stats are heating only 

and this would not apply). 

The room temperature is 

below the factory programmed 

limit of the thermostat. 

Check again when the room 

temperture goes above the   

factory programmed limit.  

Setback indicator stays ON or 

OFF.  

1. Improper light sensor 

adjustment. 

2. Thermostat location is not 

optimal. 

1. Adjust light sensor          

(optional)

2. Move thermostat if         

necessary. 

Review locations to avoid 

(page 2). 

Fan runs continuously with 

thermostat system switch set 

to OFF.  

Fan switch set to the ON     

position. 

Move fan switch to the AUTO/

OFF position. 

Control relay on heating unit 

chatters. 

Low voltage

Troubleshooting your Lightstat thermostat:

  

Summary of Contents for TG Series

Page 1: ...ot be changed by the user The unit requires no batteries and no programming or reset in the event of a power failure Optionally the Lightstat thermostat can set back the temperature based on light level in the space A dark space is considered unoccupied and will turn the heating and cooling setpoints back for better savings Thermostats described are available in Heat Cool TGHC and Heat Pump TGHP m...

Page 2: ...nt electrical shock or equipment damage 3 Control voltage and current ratings must fall within the range outlined in specifications 4 Verify that the relay load does not exceed 1 amp Excessive load will damage the solid state switch Thermostat Placement Mount your thermostat vertically about 5 feet above the floor in an area that has good air circulation at average room temperature Be sure to loca...

Page 3: ...come from the factory with fixed light sensitivity This means that under normal lighting the thermostat will heat cool your space to the comfort slide setting Under low light conditions the thermostat will set the temperature back A green setback light turns ON indicating the thermostat is in the Setback mode Adjusting optional light sensor 1 Open the thermostat cover and locate the green setback ...

Page 4: ...programmed at the factory then the thermostat is in setback To bring the thermostat out of setback simpley move the temperature slide Note Typically moving the temperature slide will show the current thermostat setpoint For slide sensitive setback models the setback setpoint cannot be viewed on the dsiplay because touching the slide will bring the thermostat out of setback Adjusting the temperatur...

Page 5: ...ition model one of 3 potential issues may occur 1 When not calling for heat the furnace falsely starts its heating cycle 2 When calling for heat the furnace is chattering or does not complete its heat cycle 3 The display goes blank at times If the installation exhibits any of these issues we recommend that you add a 200 ohm minimimum 20 watt resistor from any output terminal to the C common termin...

Page 6: ...ge heat cool thermostat for heat pump applications This thermostat cannot be used on 1 Millivolt systems self generating systems that do not have a transformer or relay 2 Two transformer systems using RC and RH wires 3 DC voltage systems 4 Line voltage 120 VAC systems directly Note TGHP models do not have lock on lock off timers for backup heating Operation is strictly temperature dependent Note T...

Page 7: ...t position On right position 1 Fahrenheit Celsius 2 45 Second Lockon lockoff Timers Active 45 Second Lockon lockoff Timers Inactive 3 Lesser setback number Greater setback number 4 Fan controlled by thermostat in heat mode Fan controlled by external device in heat mode 5 Fan locked in auto when in setback Fan on allowed when in set back 6 Backup Heat Operating Differential 1 5 F 0 8 C Backup Heat ...

Page 8: ...s but the cooling does not come on some stats are heating only and this would not apply The room temperature is below the factory programmed limit of the thermostat Check again when the room temperture goes above the factory programmed limit Setback indicator stays ON or OFF 1 Improper light sensor adjustment 2 Thermostat location is not optimal 1 Adjust light sensor optional 2 Move thermostat if ...

Page 9: ...erson or organization other than the seller to assume for us any other liability in connection with this product This warranty shall not apply to any product which has been subject to misuse negligence or accident nor to any product which has not been operated in accordance with the printed instructions The company shall not in any event be liable for any consequential damages secondary charges ex...

Reviews: