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| DCG3 SERIES |
Index |
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| THERMOSTAT TROUBLESHOOTING FLOW CHART | |
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| No voltage or |
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| low voltage from |
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| purple wire |
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| between |
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| thermostat board |
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| & ECO board |
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| With an ohm meter |
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| NO | set at X1, check |
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| orange wires on |
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| set pot. (3,000 ohms |
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| at lowest setting and |
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| 0 ohms at highest |
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| setting) |
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| Replace |
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| set pot |
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| When slowly turning |
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| HAS | set pot dial from low |
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| to high, ohm reading | OK | ||||||
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| BAD SPOT | should be a smooth | |||||||
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| transition with no |
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| skips, jumps or |
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Check ECO | Replace |
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| glitches |
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and ICM | ECO board |
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NO |
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| YES | NO |
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| NO | Check orange wire |
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Will ECO board |
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Is ECO light on? | from ECO board to |
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reset? |
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| damper for 24V |
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YES |
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| YES |
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High water | Check |
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temperature | damper |
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Replace
bad
sensor(s)
OHMS
READING
NO GOOD
Take ohm reading from upper sensor and lowest sensor and compare reading with chart below.
(A temperature
reading from a water sample taken from T&P valve is also needed for this test)
OHMS OK
Check purple wire | NO | Replace |
from thermostat | thermostat | |
for 24V |
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Sensor Resistance vs. Temperature
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| Resistance (K ohms) |
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Temp. | 0 | 1 | 2 | 3 |
| 4 | 5 | 6 | 7 | 8 | 9 |
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0°C | 32648 | 31026 | 29495 | 28049 |
| 26682 | 25389 | 24166 | 23010 | 21915 | 20879 |
10°C | 19898 | 18968 | 18088 | 17253 |
| 16461 | 15710 | 14998 | 14322 | 13680 | 13071 |
20°C | 12492 | 11942 | 11419 | 10922 |
| 10450 | 10000 | 9572 | 9165 | 8778 | 8409 |
30°C | 8057 | 7722 | 7403 | 7099 |
| 6808 | 8532 | 6268 | 6016 | 5775 | 5546 |
40°C | 5327 | 5117 | 4917 | 4726 |
| 4543 | 4368 | 4201 | 4042 | 3889 | 3742 |
50°C | 3602 | 3468 | 3340 | 3217 |
| 3099 | 2986 | 2878 | 2774 | 2675 | 2579 |
60°C | 2488 | 2400 | 2316 | 2235 |
| 2157 | 2083 | 2011 | 1942 | 1876 | 1813 |
70°C | 1752 | 1693 | 1637 | 1582 |
| 1530 | 1480 | 1432 | 1385 | 1340 | 1297 |
80°C | 1256 | 1216 | 1177 | 1140 |
| 1105 | 1070 | 1037 | 1005 | 974 | 944 |
90°C | 916 | 888 | 861 | 835 |
| 810 | 786 | 763 | 741 | 719 | 698 |
40°F | 26109 | 25400 | 24712 | 24045 |
| 23399 | 22771 | 22163 | 21573 | 21000 | 20445 |
50°F | 19906 | 19383 | 18876 | 18383 |
| 17905 | 17440 | 16990 | 16553 | 16128 | 15715 |
70°F | 11884 | 11592 | 11308 | 11032 |
| 10763 | 10502 | 10248 | 10000 | 9760 | 9526 |
90°F | 7333 | 7165 | 7000 | 6839 |
| 6683 | 6531 | 6383 | 6238 | 6098 | 5961 |
100°F | 5827 | 5697 | 5570 | 5446 |
| 5326 | 5208 | 5094 | 4982 | 4873 | 4767 |
120°F | 3758 | 3679 | 3602 | 3527 |
| 3453 | 3382 | 3312 | 3244 | 3177 | 3112 |
140°F | 2488 | 2439 | 2391 | 2344 |
| 2298 | 2253 | 2209 | 2166 | 2124 | 2083 |
160°F | 1688 | 1656 | 1625 | 1595 |
| 1566 | 1537 | 1509 | 1481 | 1454 | 1427 |
180°F | 1170 | 1150 | 1129 | 1110 |
| 1090 | 1071 | 1053 | 1035 | 1017 | 999 |
190°F | 982 | 965 | 949 | 933 |
| 917 | 901 | 886 | 871 | 857 | 842 |
200°F | 828 | 814 | 801 | 788 |
| 775 | 762 | 749 | 737 | 725 | 713 |
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Copyright© by American Water Heater Company 2005. All rights reserved. |