no hot water
GAS Check the pilot light first.
ELECTRIC High Temp cut off tripped. (Push reset button on high-temp cutoff.)
Faulty thermostat Test both thermostats. Need a volt-ohm meter.
Faulty heating element Test heating element. Need a volt-ohm meter.
It doesn't say anything about the dip tube being the reason for no hot water.
E-mail me if you need more info on testing those items. Do you have a volt-ohm meter?