IV) Trouble Shooting Auto Refill, Low Water Cutoff, and Dual Level Control System (continued)
Problem |
| Possible Cause | Service Check | Remedy | ||
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E) Tank fills with water, | 1) | Thermostat off. | Visual. | Make sure knob is turned fully | ||
but heat does not come |
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| clockwise. | ||
on. |
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2) | Thermostat inopera- | Jumper across thermo- | Recalibrate thermostat. If no reme- | |||
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| tive or out of calibration. | stat terminals causes | dy, or thermostat does not cycle, | ||
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| heat to come on. | replace. | |
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| 3) | Power relay or con- | Check for voltage | If correct voltage, replace coil or | |
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| tactor inoperative. | (120V AC) across coil | entire device. If not correct voltage, | ||
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| terminals. | check for loose wires, improper | |
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| wiring or other cause. | |
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| 4) | Low electrode faulty | Jumper from “XL” termi- | Clean electrodes. Check wiring. If | |
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| or covered with lime | nal to metal enclosure | still no remedy, replace electrode | ||
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| scale. | allows unit to heat. | assembly. | ||
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| 5) | Dual Level Control | Jumper from “XL” termi- | Replace Dual Level Control. | |
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| faulty. | nal to “C” does not |
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| cause unit to heat |
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F) No water in tank, but | 1) | Thermostat and fill | Visual | Thermostat (brown wire) must be | ||
heat comes on (heater | valve connected to |
| connected to “HEAT” and fill valve | |||
damage likely). | wrong terminals on |
| (black wire) to “FILL”. | |||
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| Dual Level Control. |
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| 2) | Electrode(s) shorting | Disconnecting wire | Replace electrode assembly. If no | |
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| to ground. | (white) from “C” probe | remedy, check for improper wiring | ||
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| terminal provides low | (cut insulation for instance), or elec- | |
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| water heat cutoff and | trode tips touching metal inside tank. | |
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| tank fill. |
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| 3) | Dual Level Control | Heat comes on with no | Replace Dual Level Control. | |
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| faulty. | probe wires (HI, XL, C) |
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| connected |
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NOTE: The level control board works on the principle that water is conductive and with some pure water installations an increased sensitivity may be required in the level control system. Consult factory if this be the case.
If you still need help, call our service department at (800)
Prior authorization must be obtained from Grindmaster Corporation’s Technical Service Department for all warranty claims.
American Metal Ware 87710E Coffee Urn
Page 16
