Bradford-White Corp U4TW40T*FRN Manual Do Utilizador

 Page 41 

115 volt potential exposure. Use caution making voltage checks to avoid 

personal injury.

LED status: 

None, control 

LED not on or 

flashing. 

LED status: 

Short flash 

once every four 

seconds.

LED status: 

“Heartbeat”,

alternates 

bright/dim. 

LED status: 

Various flash-

ing error codes. 

Waiting for call

for heat. 

Thermostat call-

ing for heat. 

Verify error 

code as listed 

on page 17. 

Disconnect cord 

set as shown in

photo 9.

Using a volt meter 

set to volts AC, is

there 115VAC across 

terminals shown in 

photo 10?

Check for damage 

to AC supply

power cord.

Repair damage. 

Replace blower.  

Is there 115VAC 

across terminals 

shown in photo 11? 

Incorrect supply 

voltage polarity. 

Reconnect cord set 

shown in photo 9.  

Disconnect wire har-

ness from gas control

(see photo 12). 

Locate black & white wires at connector, it

may be necessary to pull back wire sheath to 

identify wire colors (see photo 13). 

Is there 115VAC across 

black & white wire as 

shown in photo 13? 

Call for technical support. 

Replace gas control.

N

N

N

Y

N

Y

N

Y

Wire harness 

Check for 115VAC between black and white wires. 

-NOTE-

Electronic meter probes required. Use car not to 

damage connector during this check.  

Wire sheath pulled back to 

identify wire colors 

41