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What could be the problem when red ligth is flashing on the hot water tank control?

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If its 1 blink every 3 seconds its normal operation.
Otherwise, this is the meaning of the various blinks:

No blinks = no poilet light (not enough power (in millivolts) to keep it lit.
2 flashes = insufficient voltage (in millivolts) to gas valve.
4 flashes = high water temperature (over heat sensor activated.
5 flashes = water temperature sensor failure.
7 flashes = gas control valve / thermostat failure.
8 flashes = Only occurs if the gas control valve or Temperature knob has been turned off And the thermocouple continued to produce electric power.
9 flashes = Combustion chamber temperature sensor open or shorted.
10 flashes = LDO occurrence was detected in the combustion chamber (contaminants).

Posted on Jun 28, 2019

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Posted on Jan 02, 2017

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SOURCE: red light flashing on

More information is needed.
Open following link to help identify your gas valve and access error code.
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

Add a comment and say which gas valve matches.
Then add what code is blinking for possible help.

Upvote the help.
And take advantage of fixya expert assistance live.
For a price, expert works with you while you work on water heater or any do-it-yourself project.
Fixya is always less expensive than a service call.

Posted on May 31, 2011

SOURCE: red light is flashing on

You have tank-type water heater, but type of water heater and control is not known.
For possible help, add a comment and say if you has gas or electric water heater and describe what type of gas valve or control box is giving the error code.
Open following link to identify some basic types of controls:
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

Posted on Jul 08, 2011

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http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

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More information is needed.
Open following link to help identify your gas valve and access error code.
http://waterheatertimer.org/How-to-adjust-temperature-on-water-heater.html

Add a comment and say which gas valve matches.
Then add what code is blinking for possible help.

Upvote the help.
And take advantage of fixya expert assistance live.
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Call Whirlpool for assistance: 1-877-817-6750
You will need your model number and serial number located on label on side of tank.
Serial number is required because models change as the technology evolves.

Open following link to read product details about the Energy Smart, and download typical manual.
http://waterheatertimer.org/Whirlpool-Energy-Smart-electric.html

Note: Energy Smart water heater requires 10 gauge wire and 30 amp breaker.

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There cannot be air inside the tank since your hot water faucet is not spewing air.
http://waterheatertimer.org/How-it-works.html

Also be aware that model numbers change.
Read following account of fellow who replaced control board on his 4-year-old energy smart, and how he discovered wires are reversed on newer control boards. Be sure to ask Whirlpool about this possibility, in the event they say control board is faulty and send you new board:
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Pipes on side of tank: You want cold water to enter bottom, so hot water naturally rises to the top outlet.

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element-connection-450.jpg
For images and product information
For manual


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