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Off peak hot water not heating!!! :(

Hi all, I have a problem, not sure what to do about it / who to call! I've just bought a new flat, and with absolutely NO information left by the previous tenants / landlord, have managed to figure out with a bit of googling how to work the hot water system. So it appears to be on one of these Economy 7 systems so it should automatically heat the water during the night off peak, and the control panel also gives the options to boost in the daytime (either manual or timed). When I use the boost functions during peak hours (I tried both manual and timed), the water heats up fine. But, overnight, I see that the off-peak light is lit up as though it's heating, however it doesn't heat as the water is still cold in the morning. Heating with "boost" during the day is obviously much more expensive. I tried doing a "timed boost" during overnight hours but the "off-peak" cycle overrides the boost and I still end up with no hot water. Not really sure what the issue can be as the water CAN be heated in some way, but somehow not the offpeak part. Don't know anything about the system or water heaters in general so I have no idea of the inner workings of these things. Can anyone help?? THANKS. Shaz

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  • Water Heaters Master
  • 5,245 Answers

The Economy 7 can control different types heater. Some heaters do not have off-peak ... but you can solve problem..
Copy following link:
http://waterheatertimer.org/pdf/QE7-INSTRUCTION.pdf
If timer is wired to two different elements, then the night rate element or off-peak element might be burned out. Test element with multimeter.
http://waterheatertimer.org/How-to-test-water-heater-element.html
Also this timer is wired so either Off-peak is getting power or Boost is getting power, but not both at same time.
If heater has off-peak element, then there will be a wire connected to terminal 5, going to heating unit.
If there is no wire on terminal 5, then there is no off-peak element, or wiring has not been connected. However you can change the timer function by moving wire on terminal 4 to terminal 5. Then only the off-peak timer function will operate, and not the boost.
You can also fool the timer, by setting time clock differently. Instead of setting timer for current time, rotate the dial and fudge current time by 10-12 hours so water heater thinks it's time for boost, but the actual time is during off-peak hours.
If terminals 4 and 5 both have wires, then either the element is burned out, or the timer has malfunctioned. Again, you can fool the timer by setting current time differently, and solve problem.

Posted on Apr 26, 2013

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Posted on Jan 02, 2017

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woobie dog
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SOURCE: Water heater not heating water.

Hi, W/D here.
You'll need an electrical test meter to find what ails ya. The reset button was a good idea, and it may help. If not:
1. Disconnect the power to the water heater (Trip the breaker to "Off").
2. Check the electrodes where they screw into the tank. There are two terminals. Test for continuity. If either electrode tests open, replace it.
3. With power on the heater, test for power through each thermostat to the electrode and back. Replace any defective thermostats.
Hope that this helps you, --W/D--

Posted on Aug 07, 2009

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