White Rodgers 1E78-144 White-Rodgers 70 Series Non-Programmable Single Stage Thermostat Installation Instruction

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ELECTRICAL DATA
Electrical Rating: 
 

0 to 30 VAC 50/60 Hz. or D.C. 

 

0.05 to 1.0 Amps (Load per terminal) 

1.5 Amps Maximum Total Load (All terminals combined)

THERMAL DATA
Setpoint Temperature Range: 

 

 

45°F to 90°F (7°C to 32°C) 

Operating Ambient Temperature Range: 
 

32°F to 105°F 

Operating Humidity Range: 
 

0 to 90% RH (non-condensing) 

Shipping Temperature Range: 
 

-40°F to 150°F

Reset Operation
If a voltage spike or static discharge blanks out the display or causes 
erratic thermostat operation you can reset the thermostat by pressing 

 and 

 at the same time while moving the SYSTEM switch from 

OFF to HEAT. This also resets the factory defaults. If the thermostat 

has power, has been reset and still does not function correctly contact 
your heating/cooling service person or place of purchase.
Batteries
For optimum performance, we recommend replacing batteries once 
a year with fresh “AAA” Energizer

®

 alkaline batteries.

6

7

Blown fuse or tripped circuit breaker. 

1. 

Furnace power switch to OFF.

2. 

Furnace blower compartment door or  panel 

3. 

loose or not properly installed.

Replace fuse or reset breaker.
Turn switch to ON.
Replace door panel in proper position to engage 
safety interlock or door switch. 

Pilot light not lit.  

1. 

SYSTEM Switch not set to 

2. 

HEAT. 

Loose connection to thermostat or system. 

3. 

Furnace Lock-Out Condition. Heat may also be 

4. 

intermittent. 
 
 

5.  Heating system requires service or thermostat 

requires replacement.

Re-light pilot.
Set SYSTEM Switch to 

HEAT and raise setpoint 

temperature above room temperature.
Verify thermostat and system wires are securely 
attached.
Many furnaces have safety devices that shut   
down when a lock-out condition occurs. If the  
heat works intermittently contact the furnace  
manufacturer or local service person for  
assistance.
Diagnostic: Set SYSTEM Switch to 

HEAT and 

raise the setpoint above room temperature. Within 
a few seconds the thermostat should make a soft 
click sound. This sound usually indicates the ther-
mostat is operating properly. If the thermostat does  
not click, try the reset operation listed above. If the  
thermostat does not click after being reset contact  
your heating and cooling service person or place  
of purchase for a replacement. If the thermostat   
clicks, contact the furnace manufacturer or a  

 

service person to verify the heating is operating    
correctly.

SYSTEM Switch not set to COOL. 

1. 

Loose connection to thermostat or system. 

2. 

Cooling system requires service or thermostat 

3. 

requires replacement.

Set SYSTEM Switch to 

COOL and lower  setpoint  

temperature below room temperature.
Verify thermostat and system wires are securely    
attached.
Same procedure as diagnostic for No Heat  

 

condition except set the thermostat to 

COOL and   

lower the setpoint below the room temperature.    
There may be up to a five minute delay before the  
thermostat clicks in Cooling.