Roberts Gorden BH-200, BH-60, BH-40, BH-150, BH-175, BH-115, BH-100 Troubleshooting Flow Chart, Yes

Turn up thermostat.	NO
Does the blower turn on?

YES

Place a jumper across the
thermostat terminals.	NO
Does the blower turn on?
YES
Check thermostat wiring
and replace thermostat if
necessary.
Unplug burner and check

Is there power 120 V at

the burner?

NO

Check relay wiring (if applicable) and wiring

to the burner.

Is the igniter gap

YES

Unplug burner. Does the	NO
blower turn freely?
YES
Replace blower.

Is the vent pipe or the inlet of

Remove obstruction.

YES

Is the blower obstructed?

NO

Blower bearings may have

failed. Replace blower.

12.1 Troubleshooting Flow Chart

Is there spark at the igniter? NO igniter and ignition wire. Are NO they damaged?

YES

Replace igniter and ignition wire as needed.

Check wiring between the

power cord, blower motor NO and transformer.

set at 1/8"?

NO

Carefully reset spark gap to 1/8"

With the blue and yellow wires still removed, is the voltage at the transformer black and white leads 120 V?

YES

Replace transformer.

YES

NO

the burner obstructed?	YES
NO
Are the air hoses to the	NO
pressure switch secure and
leak free?
YES
Remove the blue and yellow
wires from the transformer.
Is there 24 V at the
transformer secondary?
YES
Reconnect transformer
wires. Place a jumper wire	YES
across the pressure switch.
Is there a spark?
NO
Replace ignition module.

Remove obstruction.

Repair, replace, or tighten hoses as necessary.

Replace pressure switch

SECTION 12: T

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ROUBLESHOOTING