TTW SERVICE PROCEDURE IX

115 VAC Trace

115 VAC Circuit Trace

WARNING

115 volt potential exposure. Use caution

making voltage checks to avoid personal injury.

Step 1. Verify 115VAC and proper polarity at wall outlet.

Step 2. With unit plugged in and control power switch in the “ON” position verify LED status.

LED status

LED status

None, Control LED not

Short flash, once every

on or flashing.

four seconds.

 

 

 

 

 

 

Waiting for

 

 

call for heat.

 

 

28

Disconnect cord set as

 

 

shown in photo 28

 

 

Using a volt meter set

to volts AC, is there

LED status

LED status

“Heartbeat”, alternates

Various flashing error

bright/dim.

codes.

 

 

 

 

Thermostat calling

Verify error code as

for heat

listed on page 13

29

30

115VAC across

N

Check for damage to Y

Repair damage

AC supply power cord.

 

 

terminals shown in

photo 29 ?

Y

N

Replace Blower

Is there 115VAC

Y

across terminals

 

shown in photo 30 ?

 

 

N

 

 

 

 

 

 

Incorrect supply

 

voltage polarity

 

Locate black & white wires at

connector, It may be necessary to pull back wire sheath to identify wire colors.

(see photo 32)

Reconnect cord set shown in photo 28.

Disconnect wire harness

from gas control (see photo 31).

31

Wire harness

32

Wire sheath pulled back to

identify wire colors

Is there 115VAC

 

across black & white Y

Replace gas

wires as shown in

 

control.

photo 32?

 

 

N

 

 

 

 

 

 

 

Call for technical

support.

Page 30

Check for 115VAC between black & white wires.

-NOTE-

Electronic meter probes required. Use care not to

damage connector during this check.

Page 30

30

Page 30
Image 30
Bradford-White Corp M4TW60T*F, M2TW50T*F, M4TW50T*F, M2TW65T*F, M1TW40S*F, M1TW50S*F, TW450S65F, TW465S65F VAC Circuit Trace

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