Williams 2903511 Starting Sequence Electrical, Troubleshooting Step, Summer Mode Step

Troubleshooting

Starting Sequence (Electrical)

Step 1

1.Check L1 – L2 (Supply 120 V, 60 Hz)

2.Check M9 (Main fuse)

Troubleshooting Step 1

Point 1 (L1-L2)

No voltage (120 V).

Check the electrical supply line, wiring and connections.

Point 2 (M9) Fuse damaged.

Check the electrical supply line and replace the fuse.

Summer Mode

Step 2

3.Check Z1 (Reset summer/winter switch). The switch is closed if there is no ignition block.

4.Check Z2 (Hi-Lo flame and fan speed switch) Button down - Minimum velocity

Button up – Maximum velocity

Troubleshooting Step 2

Point 3 (Z1)

Z1 is open and no ignition.

Check wirings and connections. If everything is okay, replace the switch.

Point 4 (Z2)

Z2 is down but the fan motor runs at the maximum velocity (120 V).

Z2 is up but the fan motor runs at the minimum velocity (<120 V).

Check wiring and connections. If they are okay, replace the switch.

Winter Mode

Step 3

5.Check Z1 (Reset summer/winter switch).

Button up – winter mode.

6.Check Z3 (Manual-automatic switch). Button up – manual mode

Button down – automatic mode.

7.Check M2 (Fan thermostat).

The thermostat is closed only when its temperature is higher than 104 °F.

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