© Copyright 2015 - Carlin Combustion Technology, Inc.
MN50200 022415
Service & Troubleshooting
Burner (control) will not come on
No power to control
• Check limit circuit to the control (at least 102 VAC).
• Check all electrical connections.
Control is in lockout
• Red LED will be on. Press the reset button for 1 sec-
ond.
• If the control returns immediately to lockout, the
Safety Monitoring Circuit may have detected an
internal control problem. Replace the control.
CAD cell seeing light
• Green LED on, and amber LED blinking 1 second
on, 4 seconds off. Remove one yellow lead from FF
terminals, and the flame test plug.
If the amber LED remains flashing and green LED on,
the control is defective.
If the amber and green LEDs go OFF, the control is
OK, and;
• light is leaking into the burner housing, or
• CAD cell is defective, or
• There is a problem with the CAD cell wiring or
holder.
• If appliance was recently shut down, CAD cell may
see residual hot spots in chamber.
To troubleshoot:
• Attach multimeter to monitor CAD cell resistance.
Dark resistance should be over 50K ohms, and
room light resistance (control flipped open) should
be at most 10K ohms. Replace cell if necessary or
reinstall and close the burner housing.
• Check for stray light by measuring the CAD cell
resistance looking into the inactive combustion
chamber. It should read at least 50 kohms.
Repeated flame failures (
flashing red LED)
Check for:
• CAD cell is defective. Replace.
• Air leaking into oil line causing flame out.
Check oil line connections and filter gasket.
• Defective nozzle causing flame to be erratic.
Change nozzle.
• Excessive airflow or draft causing flame to leave
burner head.
Check for proper air band setting and draft.
• Excessive back pressure causing flame to be er-
ratic. Check appliance and flue for sooting/plugging.
Control locks out after TFI (
red LED on)
Check for:
• No oil to burner. Check oil supply, filters, lines.
• Shorted electrodes. Inspect for cracked porcelain
and replace as needed.
• Poor spark. Check electrode spacing and condition
per burner manual. Replace or realign if necessary.
• Nozzle clogged. Replace nozzle.
• Airflow too high. Check air band setting.
• Ignitor module defective. Replace if no spark.
• CAD cell defective
• Oil valve (if used) stuck in closed position.
• Check wiring connections.
Blinking Green LED
• Weak or unstable flame.
• Check ohms.
• Check CO
2
level.
FROZEN PIPES/WATER DAMAGE: This is not a freeze protection device. Suitable freeze protection monitoring or
other precautions are recommended to protect against ruptured pipes/water damage caused by fuel outage, safety
related fault conditions, or equipment failures.
