Gas Units, the first thing to check would be the pilot light.
The "upper controls" consist of the High-Temperature Limit Switch and Upper Thermostat.
Optionally remove shower head(s) and aerators from sink faucets and spray heads to prevent sediment crack ws ftp 7 professional 12.4 from clogging them.
43 If line voltage is found, wait for water to heat or perform the Ohms (or Resistance) checks on the elements once more with the power off.
If this happens twice, you need to find/replace the faulty thermostat.
Connect a garden hose to the drain valve at bottom of the tank and extend the hose to a floor drain or some other point that is lower than the drain valve as the tank will only drain down to the highest point of the.
Try using a small stiff bristle brush to rub around the opening and see if that clears.