Vacation mode changes how some heaters maintain hot water during periods of little or no use. Its behavior varies by model. Check the control label and owner’s manual to see what your unit does and how to restore its normal setting.
Plan for the return to normal operation
A tank may need time to recover before it can supply a shower. If the unit has a schedule, note when it should resume normal heating. Use the documented controls and check for a displayed fault if the heater does not return to service as expected.
Describe what happened if hot water stays unavailable
Tell the technician which mode was selected, how long it has been since you changed it, and whether every hot tap is affected. Share the model and any display message. That helps distinguish a delayed recovery from a problem with heating or controls.
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