Turbo Chef Technologies Residential Single and Double Wall Oven service manual Troubleshooting

6.6TROUBLESHOOTING

°F	0°	+20°	+40°	+60°	+80°	+100°	+120°	+140°	+160°	+180°	+200°
0°	90.03 Ω	97.39 Ω	101.74 Ω	106.07 Ω	110.38 Ω	114.68 Ω	118.97 Ω	123.24 Ω	127.50 Ω	131.74 Ω	135.97 Ω
+200°	135.94 Ω	140.18 Ω	144.38 Ω	148.57 Ω	152.74 Ω	159.90 Ω	161.04 Ω	165.17 Ω	169.29 Ω	173.39 Ω	177.47 Ω
+400°	177.47 Ω	181.54 Ω	185.60 Ω	189.64 Ω	193.67 Ω	197.69 Ω	201.69 Ω	205.67 Ω	209.64 Ω	213.60 Ω	217.54 Ω
+600°	217.54 Ω	221.47 Ω	225.38 Ω	229.28 Ω	233.17 Ω	237.04 Ω	240.90 Ω	244.74 Ω	248.57 Ω	252.38 Ω	256.18 Ω
Figure 6.2: Temperature-Ohm Chart (Fahrenheit)

°C	0°	+10°	+20°	+30°	+40°	+50°	+60°	+70°	+80°	+90°	+100°
0°	100.00 Ω	103.90 Ω	107.79 Ω	111.67 Ω	115.54 Ω	119.40 Ω	123.24 Ω	127.07 Ω	130.89 Ω	134.70 Ω	138.50 Ω
+100°	138.50 Ω	142.29 Ω	146.06 Ω	149.82 Ω	153.58 Ω	157.31 Ω	161.04 Ω	164.76 Ω	168.46 Ω	172.16 Ω	175.84 Ω
+200°	175.84 Ω	175.91 Ω	183.17 Ω	186.82 Ω	190.45 Ω	194.07 Ω	197.69 Ω	201.29 Ω	204.88 Ω	208.45 Ω	212.02 Ω
+300°	212.02 Ω	215.57 Ω	219.12 Ω	222.65 Ω	226.17 Ω	229.67 Ω	233.17 Ω	236.65 Ω	240.13 Ω	243.59 Ω	247.04 Ω

Figure 6.3: Temperature-Ohm Chart (Celsius)

RTD

The procedures below outline troubleshooting procedures for the RTD in the Gen 1, Gen 2, and Single Wall Oven.

Troubleshooting the RTD (Gen 1),

1.Turn oven power off and pull the oven 11” (280 mm) out of the cabinet.

2.Remove the top front cover.

3.Remove P9 from the control board and test the lower RTD on pins P9-5 and P9-6 for 109 ohms at 75°F (24°C).

4.Remove P10 from the board and test the upper sensor on pins P10-19 and P10-20 for 109 ohms at 75°F (24°C).

5.If 109 ohms (or appropriate value) are present, replace the control board and retest. If not, replace the appropriate RTD and retest.

Troubleshooting the RTD (Gen 2),

1.Turn oven power off and pull the oven 11” (280 mm) out of the cabinet.

2.Remove the top front cover.

3.Remove J16 from the control board and test the lower RTD on pins J16-8 and J16-9 for 109 ohms at 75°F (24°C).

4.Remove J15 from the control board and test the upper RTD on pins J15-20 and J15-21 for 109 ohms at 75°F (24°C).

5.If 109 ohms (or appropriate value) are present, replace the control board and retest. If not, replace the appropriate RTD and retest.

Troubleshooting the RTD (Single Wall Oven),

1.Disconnect power from the oven.

2.Disconnect J15 from the control board.

3.Test the RTD on pins J15-20 and J15-21 for 109 ohms at 75°F (24°C).

4.If 109 ohms (or appropriate value) are present, replace the control board and retest. If not, replace the RTD and retest.

Transformer, Clock,12 VAC (Gen 1)

1.Test for 12 VAC at the terminals at the two thin white wires.

-If 12 VAC is present, the transformer is functioning properly.

-If no voltage is present, continue to step 2.

2.Test for 120 VAC at the terminals of the thick white and blue wire.

-If 120 VAC is present, the transformer is faulty and needs to be replaced.

-If no voltage is present, investigate the 15 amp fuse/fuse block.

Transformer, Clock,12 VAC (Gen 2)

1.Test for 12 VAC at terminalsRBJ18-1 and RBJ18-2 on the relay board.

-If 12 VAC is present, the transformer is functioning properly.

-If no voltage is present, continue to step 2.

2.Test for 120 VAC at the terminals at the thick white and blue wire.