Roberts Gorden Compact Tubular Unit Heaters CTCU 27 - Manual (Page 40)

COMBAT ® CTCU U NIT H EATERS I NSTALLATION O PERATION AND S ERVICE M ANUAL
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15.3 Troubleshooting for Flame Supervision System
15.4 Troubleshooting for Solenoid Valves
NOTE: Minimum flame probe current 1 µA DC.
To 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.