Maytag MAH5500BWW Service Manual - Page 147

Figure 4-7 b. If the fuse is functioning, check the six semiconductors on the heat sink visually for any damage. If damaged, replace motor control/wire harness assembly complete. c. If no visible damage is present, check motor windings for any open circuits. (See Figure 4-8 & 4-9) Replace motor if necessary. Figure 4-8 Figure 4-9 9. Unplug the washer power cord and replace motor control board connector JP4 when finished. HEATER ASSEMBLY The heater assembly located in the sump area of the outer tub is only on the MAH7500, LCD washer only. A thermistor located in the heater assembly monitors the water termperature in order to cycle the heater on/off to regulate the proper temperatures. After the wash level has been reached, the control will turn the heater on until the heater thermistor indicticates the temperature reaches or exceeds the target main wash temperature. Then the control will de-energize the heater. The heater will be turned back on when the heater thermistor indicates the temperature falls below the target main wash temperature – 5°F during the main wash. The control will cycle the heater off again when the temperature reaches the target wash temperature. The intent is to keep the temperature between the target main wash temperature and 5°F below that. When the heater is off, it will remain off for at least 10 seconds, and when the heater is turned on, it will remain on for at least 10 seconds. The heater should be turned off and will remain off when the maximum heater on time limit is reached (37 minutes), or the end of the wash period is reached. The heater will be turned off at the beginning of bleach fill at the end of main wash. The heater will be turned off during add fills. Heater Will Not Turn On 1 The heater will not turn on if the door is not closed or if there is a problem with the door sense circuit. 16010486 (16008373-05) Revised 02/01 Section 4. Electrical Components & Testing ©2001 Maytag Appliances Sales Company 4-7