White Rodgers 1F78-144 White-Rodgers 70 Series Non-Programmable Single Stage Thermostat Installation Instruction

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6

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 (0°C to 41°C) 

Operating Humidity Range: 
 

0 to 90% RH (non-condensing) 

Shipping Temperature Range: 
 

-40°F to 150°F (-40°C to 66°C)

7

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 best results, replace batteries once a year with new premium 
brand alkaline batteries such as Duracell

® 

or Energizer

®

. 

Blown fuse or tripped circuit breaker. 

1. 

Furnace power switch to OFF.

2. 

Furnace blower compartment door or 

3. 

panel 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 

4. 

also be intermittent. 
 

Heating system requires service or 

5. 

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 shutdown 
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 thermostat is operating 
properly. If the thermostat does not click, try the reset 
operation listed below.  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 

3. 

thermostat 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.