Question about Intermatic EH40 Energy Controls - Electronic Time Switches - Water Heater

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My Intermaric EH40 does not work. The time display is blank and the load switch and on/off switch do not work. Is it completely shot?

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You've lost power to the timer. Look in your main circuit breaker panel for a two-pole breaker that has tripped. Turn it to full OFF, then back ON.
Sometimes it hard to detect if a breaker has tripped, so turn it OFF, then ON anyway.
If that doesn't work it's possible that the circuit breaker is bad.

Posted on Sep 12, 2010

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Water heater timer not working or bad wiring?


10/15/2012
Hi Liz.
This is a live answer. And you can add a comment after trying following step, and I will comment back..
Replace battery, and then reset the timer using reset button located to left of display screen.
http://waterheatertimer.org/pdf/eh40-english.pdf

Oct 15, 2012 | Intermatic EH40 - Electronic Water Heater...

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When power is applied load one reads o.k. load two reads zero why?


You posted under EH40 240Volt programmable timer.
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html

If I understand correctly, you are testing the terminals when timer turns ON?
Test shows 120V between terminal 4 and ground wire.
Test shows 0 volts between terminal 6 and ground wire.

Solution:
Test terminal 3 to ground -and- test terminal 5 to ground and make sure each tests 120V.
Test terminal 3 to terminal 5 for 240V.

If terminals 3 and 5 test correctly, but terminal 6 never has power, then relay inside timer has gone bad.
Contact Intermatic about 1 year limited warranty
http://www.intermatic.com/customer%20service.aspx

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

May 28, 2011 | Intermatic EH40 - Electronic Water Heater...

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After 7 years working properly, the event button has stopped working. There is no way to start the load in manual, or to change the program... What can I do?


You posted under EH40 Intermatic programmable timer.
EH40 Manual:
http://waterheatertimer.org/pdf/eh40-manual.pdf

1) EH40 uses size A battery. Replace battery.
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html#Battery
2) Reset the timer: Press and hold reset button for several seconds
3) Contact Intermatic because they are aware of specific problems with specific timers
http://www.intermatic.com/customer%20service.aspx
4) Other folk have reported EH40 and EH10 last about 3 years.
EH40 has 1 year limited warranty.
I test timers: 7 years is reasonable run for inexpensive electronic time switch.
5) For longer lasting timer, consider Next Generation: battery is replaced every 8 years
http://www.intermatic.com/products/timers/electronic%20time%20switches/next%20generation%20time%20switches.aspx

Add a comment for more free help.
Also take advantage of fixya expert assistance live.
For a price, expert works with you while you work on timer or any do-it-yourself project.
Fixya is always less expensive than a service call.

Feb 28, 2011 | Intermatic EH40 - Electronic Water Heater...

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Timer loses program and time. Flashes wrong time. No power loss, already replaced battery. Any ideas? Jerry


1) Reset the timer.

Sometimes this works, sometimes it doesn't and timer has gone bad.
Manual for EH10
http://www.1000bulbs.com/pdf/Inter-EH10-EH40-Operating.pdf

2) Manual says:
"If the display
has scrambled information, check to be sure that
the polarity orientation of the battery is as shown on
the cover label, then press the RESET switch and hold
for at least two seconds."

3) If display shows, then contacts are good.
EH40 and EH10 have same battery carriage.

4) Add a comment for more free help.
Also take advantage of fixya phone service.
For a price, fixya expert speaks with you over phone while you work on timer or any do-it-yourself project.
We are always less expensive than a service call.

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Jan 14, 2011 | Intermatic 7 Day Electronic Timer Eh10...

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Need diagram showing a/c power and switched termanels


You posted under EH40 Intermatic timer.
The EH40 has a 240V clock
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html

The terminals are numbered 1 2 3 4 5 6
The 240Volt clock is terminal 1 and 2

The first HOT wire from breaker connects to terminal 1 and 3
The second Hot wire from breaker connects to terminals 2 and 5

The wires to Load connect to terminals 4 and 6

If you need more help, add a comment and I will help

Nov 01, 2010 | Intermatic EH40 Energy Controls -...

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My EH40 is not supplying power to the water heater. I hooked the power line in to posts 1 and 2 and I hooked the load out to posts 4 and 6. When I use my power checker it reads no power to posts 3,4,5,...


I have an EH 40 sitting in front of me right now.
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html
The link above shows correct 240V water heater timer wiring for EH40
Link below shows an overview picture of EH 40 connected to 240V water heater
http://waterheatertimer.org/images/EH40-water-heater-circuit-5.jpg
http://waterheatertimer.org/240-v-water-heater-circuit.html


EH40 has a 240V clock.
Terminals 1 and 2 send power to the 240V clock
Power to the clock terminals do not pass through timer to any other terminal

How to wire EH40 for 240V
240V line has 2 hot wires from breaker box.
Lets call these wires Hot1 and Hot2
These wire are interchangeable on 240V circuit
Hot1 connects to terminal 1 with a jumper to terminal 3 (or connect to 3 and jumper to 1)
Hot2 connects to terminal 2 with a jumper to terminal 5 (or connect to 5 and jumper to 2)

240V circuit has 2 wires going to the Load
Let's call these Load1 and Load2
These wires are interchangeable on 240V circuit
Load1 connects to terminal 4
Load2 connects to terminal 6

If the timer is still not working, go back to the breaker and test if it is delivering 240V to the circuit.
If breaker is bad on one leg, then the circuit can test with live power, but the 240V appliance will not work.
240V circuit requires both legs of 240V before circuit is complete.

Oct 24, 2010 | Intermatic EH40 - Electronic Water Heater...

1 Answer

After hooking up line wires to motor and load wires from water heater to load terminals,diasgram shows jumper wires from terminbal 1 to terminal 3 and terminbal 2 to tertmninal 5. voltage is 240.thank you ...


That is correct.

LINE 1 (incoming hot wire from source or circuit breaker) connects to terminal #1 then jumps over to terminal #3 using the _same_ gauge wire.

LINE 2 (other incoming hot wire from source or circuit breaker) connects to terminal #2 then jumps over to terminal #5.

The LOAD (outgoing to water heater) then connects to terminals 4 and 6.

Aug 09, 2010 | Intermatic EH40 - Electronic Water Heater...

1 Answer

Heater controls don't work


The aperage at start up when you turn on the heater are to great. The load at start up is greater than when it is actually running which in my opinion means the load is greater than the EH40 amperage rating is. In short term, the EH40 contacts are not able to handle the load. You need a higher rated control, it wasn't sized up correctly by your vendor,

Jan 25, 2009 | Intermatic EH40 Energy Controls -...

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