Service manual

SECTION 14: TROUBLESHOOTING

41 of 55

14.3 Troubleshooting for Flame Supervision System

NOTE: Minimum flame probe current 1 µA DC. Typical flame probe current 3-5 µA DC.

o measure flame current, connect a 0 - 50 µA DC meter in series with the flame probe. If the meter

reads negative values, then reverse the test leads.

Repair or replace as

required.

Replace ignition control.

Use General

Troubleshooting section to

trace the fault.

Heater Operating

TROUBLESHOOT ENDS.

Repair or replace as

required.

Is inlet burner gas pressure

correct? Is live and neutral

polarity correct? Is

flame probe circuit correct?

Is there a current flowing in

the flame probe circuit with

no flame present?

Ye s

Does “lockout” occur when

there is a flame present?

Ye s

Is the connecting lead

damaged? Is the flame probe

damaged or touching earthed

components?

Is the flame present and

at least 1 µA DC flame

current?

Connect a DC ammeter in

series with the flame probe.

Ye s

START

If problems persist, contact

Roberts-Gordon LLC at