[coliecam]

No water heating or heat drying in dishwasher. Water heating light does come on on control panel. Element, thermostat or is there are water temp sensor in this model? I couldn't find reference to one in the diagrams. Thanks if yiou can help or even if you can't.

[denman]

Here are your parts
Replacement parts for WHIRLPOOL GU1500XTLB1 Undercounter Dishwasher | AppliancePartsPros.com

Here is a manual which should help sort this out.
https://secured.whirlpool.com/Servic...LE/8178022.pdf

Element, thermostat or is there are water temp sensor in this model?
Thermostat is a hi-limit Item 30 in Section 7 of the parts
Temp sensor is a thermistor Item 25 in Section 8

If the cycle times are normal I would start with the thermistor.
The unit thinks the temperatures are OK so progresses merrily through the cycle.

If the cycle times are longer, I would remove power from the unit and check the thermostat and heater with a meter. The unit is waiting for the water to get to set point it does not but there is usually a default time where the unit will continue the cycle.
Be sure to disconnect one side of the device you are checking this prevents you from reading an alternate/parallel circuit path.
Thermostat should be 0 ohms and the heater about 20 ohms.

[coliecam]

Thanks for the very complete response to my questions. The service on this site is awesome. Collecam