Either the circuit breaker at the electrical panel is in the off position, or the water heater may be off. Any of these scenarios could be the cause of a Rheem water heater not turning on.

Some filters are better than others at removing minerals that cause hard water. If you have already tried replacing the filter and are still experiencing hard water, consider upgrading to a more effective filter.

When supply lines are blocked, frozen, or kinked, water may stop dispensing from the refrigerator dispenser. If the temperature is adjusted too low, a water line that passes through the freezer will freeze. Let the line thaw if there is any ice in it.

The incorrect regeneration cycle of your water softener might be caused by a number of factors. This includes an inadequate supply of electricity, a power outage that resulted in an incorrect setting of the clock, and a broken timer. Replace the damaged components to make the cycle functional once more.

Always observe safety precautions when lighting a water heater pilot with an ignition mechanism. It would be wise to remember you are working with combustible gas. I recommend checking your water heater for any gas leaks first before igniting the pilot light. You can use a gas leak sniffer for this purpose. If you prefer the old-school method, you can make a soapy solution and apply it over the gas connection. Bubbles in the area suggest a possible gas leak. You might want to retighten the gas line connection. It would also be best to check the gas connection for a thin and yellow PTFE tape. This product provides a good seal, similar to Teflon tape for water connections. If the sealant is absent, you might want to disconnect the gas line, wrap PTFE tape around the thread, reinsert it, and retest for gas leaks. If none of the solutions worked, you might want to forego the pilot lighting and instead call a professional to fix the issue.

If the drainage line is attached higher than the water softening unit, check that. Twisted pipes may obstruct the drainage system and result in poor drainage. Don't forget to check the exit end because it can be submerged and obstruct the brine's smooth flow.