Garland 200 service manual Trouble Shooting Table, Start

TROUBLE SHOOTING TABLE

START

TURN GAS SUPPLY OFF. TURN CONTROLLER TO CALL FOR HEAT POWER TO MODULE

(24V NOMINAL)

NO

Note: Before trouble shooting familiarize yourself with the startup procedure.

Check line voltage power, low voltage transformer, limit controlled and wiring.

YES

SPARK ACROSS IGNITER/

SENSOR GAP

YES

TURN GAS SUPPLY ON

PILOT BURNER LIGHTS?

YES

SPARK STOPS WHEN

PILOT IS LIT?

YES

MAIN BURNER LIGHTS?

YES

SYSTEM RUNS UNTIL CALL FOR HEAT LOSS?

YES

CALL FOR HEAT ENDS

SYSTEM SHUTS OFF?

YES

TROUBLE SHOOTING

ENDS

	Pull ignition lead		• On models with vent damper plug, make sure vent damper
	and check spark and	NO	had not be installed, the remove. Replace vent damper if
NO	module.		necessary.
			• On other models, replace module
	Spark okay?
	YES

•Check ignition cable, ground wire, ceramic insulator and gap and correct.

•Check boot of the ignition cable for signs of melting or buckling. Take protective action to shield cable and boot from excess temperature.

•Check that all manual gas valves are open, supply tubing and pressure are good, and pilot burner orifice is not blocked.

NO	• Check electric connections between module and pilot operator on gas control.
	• Check for 24 VAC across PV-MV/PV terminals on module. If voltage is okay, replace gas control; if
	not, replace module.
	Note: If S5800B, H; S6810B, H goes into lockout, reset system. For S6800M, wait 6 minutes nominal
	for retry or reset system
	• Check continuity of ignition cable to ground wire.
	• Clean flame rod.

NO • Check electrical connection between flame rod and module.

•Check for cracked ceramic flame rod insulator.

•Check that the pilot flame covers the road and is steady and blue.

•Adjust pilot flame.

•If problem persists, replace module.

•Check for 24 VAC across MV-MV\PV terminals. If no voltage, replace module.

NO • Check electrical connections between module and gas control. If okay, replace gas control or gas control operator.

Note: If S8600B, H; S6810B, H goes into lockout, reset system. For S6800M, wait 6 minutes, nominally for retry or reset system.

NO • Check continuity of ignition cable and ground wire.

Note. If ground is poor or erratic, shutdowns may occur occasionally even though operation is normal at the time of checkout.

•Check that the pilot flame covers flame rod and is steady and blue.

•If checks are okay, replace the module.

NO • Check for proper controller operation

•Remove MV lead at module; if valve closes, recheck the temperature controller and wiring; if not, replace gas control.

Repeat procedure until trouble free operation is obtained.

Part # MCOSM06 Rev 1 (11/03/08) Page 29