Field Controls MPL-B, WML-C manual Table C-3 R7184 Troubleshooting, Corrective Action

Table C-3: R7184 TROUBLESHOOTING

Condition: Burner motor does not start when there is a call for heat.

Procedure	Status	Corrective Action
1. Check that limit switches are	N/A	N/A
closed and contacts are clean.

2.Check for line voltage power at

	the oil primary control. Voltage
	should be 120 Vac between the	N/A		N/A
	black and white lead wires on
	the oil primary control.
3. Check indicator light with burner		Indicator light is on.	Cad cell is defective, sees external light, or connections have
	off, no call for heat (no flame).		shorted. Go to step 4.
		Indicator light turns off.	Eliminate external light source or permanently shield cad cell.
			•	Replace cad cell with new cad cell and recheck.
4.	Shield cad cell from external		•	If indicator light does not turn off, remove yellow lead wires
				from R7184 and recheck.
	light.	Indicator light stays on.
			•	If indicator light is still on, replace the R7184 control.
			•	If the indicator light turns off, replace cad cell bracket
				assembly.
5.	Verify that the oil valve is closed
	during the “valve on delay”
	period by opening view port and	Indicator light is on.	If flame is present, replace the oil valve.
	verifying that no flame is present
	during the 15-second “valve on
	delay”.
			Trouble is in thermostat circuit. Check thermostat-wiring
		Burner starts.	connections.
6.	Jumper thermostat (T -T)		If connections are clean and tight, check thermostat wires for
	terminals on R7184		continuity.
			•	Disconnect line voltage power and open line switch.
	IMPORTANT		•	Check all wiring connections.
		Burner does not start.	•	Tighten any loose connections and recheck.
First remove one thermostat lead			• If burner still doesn't start, replace R7184.
wire.
			If burner still doesn't start, check the oil burner motor. It may be
			seized or burned out.

Condition: Burner starts then locks out on safety with indicator light flashing at 1/2 second on, 1/2 second off.

Procedure	Status	Corrective Action
7. Reset oil primary control by	Indicator light stops flashing.	Go to Step 8.
	Indicator light continues to flash
pushing in and releasing red		Verify that the control is not in restricted mode. (See notes at end of
reset button.	at 1/2 second on, 1/2 second off	this table.). If not in restricted mode, replace R7184
	rate.

27 30318 R4 9/9/2005