Carlin 70200 - Manual (Page 4)

Service & Troubleshooting
Burner (control) will not come on
No power to control
• Check line voltage to the control (at least 102
vac
).
• Check all electrical connections.
Control is in lockout
• Press the reset button for 1 second.
CAD cell seeing light
• 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:
• Press the ▲ button to display cad cell Ohms. Dark resis-
tance should be over 50K ohms, and room light resistance
(control flipped open) should be less than 10K ohms.
Replace cell if necessary, or reinstall and close the burner
housing.
.• Press the ▲ button to display cad cell Ohms. Check for stray
light by measuring the CAD cell resistance looking into the
inactive combustion chamber. It should read greater than 50K
ohms.
Other no start problems
If the CAD cell is OK,
• Valve lead voltage on too early. Correct bad connection.
• Line voltage <90 VAC. Check line voltage.
• Motor relay welded. If valve has no voltage, and line voltage
OK, the issue is a welded motor relay. Replace the control.
• Motor current less than 0.2 Amps.
Repeated flame failures
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 erratic- check
appliance and flue for sooting/plugging.
Control locks out at end of TFI
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.
© Copyright 2012 - Carlin Combustion Technology, Inc. Carlin part number MN70200 Rev. 02/24/14
3. Next, press the ▼ button to determine the cause of the fault. The display will show the fault number (in this case, fault No. 1) followed by
an asterisk (*) and the problem experienced (ex. 1*CAD Ohms 5040 Ohm). This would indicate that the fault condition was caused by a high
CAD cell reading
4. Continue to press the ▼ button to view other possible causes of the fault. Fault conditions are indicated by an asterisk. Normal readings
(non-fault readings) will be indicated with a colon in place of the asterisk.
5. To view faults experienced in earlier run cycles, press the ► button. The control will display 2:Fault Message, followed by 3:Fault
Message, etc. Press the ▼ button (see step 3 above) to determine the cause of the fault selected.
To Exit History Menu: Press ESC button for three seconds to exit the History menu at any time.
Status Icons
Status Icons will appear at the top of the 70200 display to indicate the control’s current operating condition.
POWER- Indicates that the control is powered
TT- Displayed when the TT terminals are physically jumpered, jumpered in the set-up menu, or when thermostat is calling for heat.
LIMIT- Indicates that the burner limit circuit is powered.
IGNITOR- Indicates that the ignitor is energized (flashes if ignitor not detected)
MOTOR- Indicates that the motor is energized (flashes if motor not detected)
VALVE- Indicates that the valve is energized (on entry to pump prime will flash if not detected)
VENT- Indicates vent input is active (when vent input is selected)
FAULT- Flashes in unison with other status icons indicating a problem exists in that area
Fault History continued...
Notes: