Bunn twf-ez service manual TROUBLESHOOTING cont HEATING CIRCUIT PROBLEM, Probable Cause, Remedy

Models: twf-ez

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TROUBLESHOOTING (cont.)

HEATING CIRCUIT

PROBLEM

Water does not heat to proper temperature

IMPORTANT: Make sure no tem- perature tests are taken before the ready light is "ON". Tank tempera- ture must be stabilized before read- ings are taken.

PROBABLE CAUSE

1.Water not touching temperature probe

2.Temperature Probe

3.Limit Thermostat

CAUTION: Do not eliminate or by- pass limit thermostat or thermal fuse. Use only BOM replacement part # 29329.1000.

4. Tank Heater

REMEDY

Remove probe and grommet. Look into hole on tank lid. Water must be within one inch from top of tank.

Refer to Service - Temperature Probe for testing procedures. See page 23

Refer to Service - Limit Thermostat for testing procedures. See page 19

Refer to Service - Tank Heater for testing procedures. See page 22

Spitting or excessive steaming

1.

Lime build up on temperature

 

probe, tank or tank heater

 

2.

Temperature Probe

 

3.

Control Board

Inspect probe and tank assembly for excessive lime deposits. Delime as required.

Refer to Service - Temperature Probe for testing procedures. See page 23

Set the temperature to 205°F (96°C). Let tank temperature sta- bilize. If temperature in tank is above temperature setting by more than 7°F (4°C), replace the control board. See page 24

Brewer is making unusual noises

1.

Plumbing lines

 

2.

Water supply

 

3.

Lime build up

Plumbing lines should not rest on the counter top.

The brewer must be connected to a cold water supply.

Remove the tank lid and clean in- side of tank with a deliming agent, if necessary.

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Bunn twf-ez service manual TROUBLESHOOTING cont HEATING CIRCUIT PROBLEM, Probable Cause, Remedy