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Page 22

FIG. 22 RELAY

P1478

Location:

The relay is located under the top cover or top warmer 

housing, FIG. 22.

Test Procedure:

1.  Disconnect the plug terminal from the relay to the 

main wiring harness. Check the voltage across 

the pins of the black wire (P3) and white wire 

(P2) on the main harness with a voltmeter when 

the On/Off brew station warmer switch is in the 

upper “ON” position.  Connect the brewer to the 

power source.  The indication must be:

 

a) 120 volts ac for two wire 120 volt models and 

three wire 120/240 volt models,

 

b) 200 or 240 volts ac for two wire 200 volt or 

240 volt models,

 

c) 100 volts ac for two wire 100 volt models.

2.  Disconnect the brewer from the power source.

3.  Check the voltage across the pins of the blue wire 

(P1) and white wire (P2) on the main harness 

with a voltmeter when the On/Off brew station 

warmer switch is in the upper “ON” position and 

the start switch is pressed to the lower posi-

tion and held. Connect the brewer to the power 

source. The indication must be as described in 

step 1.

4.  Disconnect the brewer from the power source.

If voltage is present as described, reconnect relay plug 

to harness and proceed to #5.

If voltage is not present as described, refer to the Wir-

ing Diagrams and check the brewer wiring harness.

5.  Disconnect the plug terminal from the relay to the 

solenoid jumper wire. Check the voltage across 

the pins of the black wire (P3) and white wire 

(P2) on the relay with a voltmeter when the On/

Off brew station warmer switch is in the upper 

“ON” position.  Connect the brewer to the power 

source.  The indication must be as described in 

step 1.

6.  Disconnect the brewer from the power source.

7.  Check the voltage across the pins of the blue 

wire (P1) and white wire (P2) on the relay with a 

voltmeter when the On/Off brew station warmer 

switch is in the upper “ON” position and the start 

switch is pressed to the lower position and re-

leased. Connect the brewer to the power source. 

The indication must be as described in step 1.

8.  Disconnect the brewer from the power source.

If voltage is present as described, the relay is operat-

ing properly.

If voltage is not present as described, remove and 

replace the relay.

Removal and Replacement:

1.  Disconnect the brewer from the power source.

2.  Remove the top cover or top warmer housing.

3.  Disconnect both plug terminals from the relay.

4.  Remove the two #8-32 screws attaching the 

relay and bracket assembly to the component 

bracket.

5.  Remove the #6-32 screw attaching the relay to 

the bracket.

6.  Securely attach the new relay to the bracket using 

the #6-32 screw.

7.  Attach the new relay and bracket assembly to 

the component bracket using the two #8-32 

screws.

8.  Reconnect the relay wire terminals to their respec-

tive plugs in the main harness and the jumper 

wire at the solenoid valve.

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