Garland 200 Problem Possible Cause, Resistance vs. Temperature Chart for Internal Oven, 100, 300

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Problem	Possible Cause	Corrective Action
No display	A. No power to smart	A. Check for 24VAC between pins 1
	board	and 3 on smart board. If voltage
		present check for 24VAC at pins 1
		and 3 at relay board
	B. No power to relay board	B. Check for 24VAC into relay board
		and 24VAC out of relay board
		between pins 1 and 3 on relay
		board
Fan runs for a period	A. motor has tripped on	A. check for a minimum 6” clearance
of time, shuts down	internal thermal	at rear of unit to a wall or heat
then comes back on	overload	source
after several minutes		B. Check air intake vents on back of
		motor for obstructions
		C. If problem persists and above have
		been corrected replace motor assy
Timer slow counting	A. Timer is in hours / min	A. Refer to operations manual or
down		bulletin # B-19-2001 on how to
		change from hour / min to min /
		seconds
Temperature out of	A. 400 series controllers	A. Confirm oven cavity temp with
calibration		resistance chart. If out by more
		than 20 Ohms replace probe
	B. 200 & 300 series	B. Calibration can be performed by
	controllers	repositioning temperature dial.
	C. Potentiometer defective	C. Check for proper ‘sweep’ on
		potentiometer. 0 to 10.25KOHMS

RESISTANCE vs. TEMPERATURE CHART FOR INTERNAL OVEN

TEMPERATURE SENSOR

The chart below will provide the Ohms at various temperatures. This will enable you to determine if the temperature probe is operable.

The chart is degrees Fahrenheit.

TEMP	0°	10°	20°	30°	40°	50°	60°	70°	80°	90°
0°	932	953	974	995	1016	1038	1059	1080	1101	1122
100°	1143	1163	1184	1205	1226	1247	1267	1288	1309	1329
200°	1350	1370	1391	1411	1432	1452	1472	1493	1513	1533
300°	1553	1574	1594	1614	1634	1654	1674	1694	1714	1733
400°	1753	1773	1793	1813	1832	1852	1871	1981	1911	1930
500°	1949	1969	1988	2008	2027	2046	2065	2085	2104	2123

1-800-427-6668 www.garland-group.com Fax: 1-800-361-7745

Part # MCOSM06 Rev 1 (11/03/08) Page 89