Question about Laing Thermotech Autocirc Undersink Instant Hot Water Circulating System

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My Laing Autocirc has stopped working after less than two weeks. I have verified power and that the timer switch is set to (always) On. I can hear the pump try to come one, and then click off.

It will go "hum-click" about 10 times then sit for several minutes before repeating. It does not seem to be recirculating hot water. I have opened both taps to ensure no air bubble.

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Following link has general troubleshooting:
http://waterheatertimer.org/pdf/Troubleshoot-recirculation.pdf

If I had to guess... debris is blocking the rotor.
Disassemble connections and see if you can flush pump.
Gene


Water Heater Timers Save Money

Posted on Apr 15, 2015

Testimonial: "Thanks. I uncoupled the pump from the motor and found that one of the impeller fins had broken and was wedging the impeller in place."

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I have the AutoCirc fixed thermostat model, and I installed it last fall as part of my bathroom remodel. It worked great for a couple months, but now it does not seem to be functioning at all. I have...


If pump does not turn on when set to ON, then it sounds like pump has gone bad or timer has gone bad.
http://waterheatertimer.org/Water-heater-recirculation-system.html

If pump runs but hot water does not show up, then you might have crossover problem:
http://waterheatertimer.org/Crossover.html

Recirculation systems cannot be exposed to hard water, or pump parts clog.

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May 27, 2011 | Laing Thermotech Autocirc Undersink...

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Recirculation pump goes on even when not timed by timer i.e, it's one during times not set by the timer. My thermostat on my hot water heater is set to "warm" not "hot". So the pump...


Open following link for Re-circulation information and resources:
http://waterheatertimer.org/Water-heater-recirculation-system.html

On a new Autocirc, you can choose between 'Timed' operation or 'Thermostatic' operation using the slide switch located below timer dial.
For Thermostat operation, slide switch to ON.
For Timed operation slide switch to Timer.

This solution assumes system is functional, and the check valve and internal wiring are working. Autocirc is a quality product.

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May 03, 2011 | Laing Thermotech Autocirc Undersink...

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I have installed a new adjustable thermostat unit (E1-BCANRT1W). Temp is set at 91 deg and I am using the timer. Two time periods are set and the switch is set to timer (not ON). The unit comes on at...


Double check your slide switch.
For timer: set switch to TIMER
For thermostat: set switch to ON
If slide switch does not operate, then Autocirc may be defective

Laing (800) 554-6853
http://waterheatertimer.org/pdf/Laing-E1-E3-E10-install-instructions.pdf
http://waterheatertimer.org/pdf/Auto-circ-manual.pdf
http://waterheatertimer.org/Water-heater-recirculation-system.html

1) Household AC wiring will not affect the timer.
You can check your outlet using cheap circuit analyzer from home center.
The clock rotates one direction and the pins push small lever down which turns motor on-off.
When the OFF pins pass, the small lever snaps back and the motor turns ON.

I cannot immediately find operation manual for the E-1 model.
Typical ACT303 auto circ manual says following:

2) If timer controlled operation is desired, set timer and move slide switch to TIMER:
Manual says: tabs/pins are outward for ON times.
Another sentence says UPWARD, so I don't know which way the pins are set for sure.
So if you want timer ON for 2 hours, you would set 4 consecutive pins outward or upward.
ON for 6 hours, set 12 consecutive pins outward or upward.
If the timer turns ON in reverse of instructions, then set the pins that way.
Autocirc does not make the timer, they buy timer modules from clock-makers like Grasslin, Intermatic, etc.

3) To operate Autocir thermostatically without the timer, slide switch to ON position.
The clock dial will continue rotating

Apr 14, 2011 | Laing Thermotech Autocirc Undersink...

1 Answer

I have a Lang Autocirc with timer for 11 years. The past few months water not getting hot I timed how long hot water takes in faucet before \unit by 6' and faucet just after unit and times the same over 2...


Autocirc can be uninstalled and the pipe cleaned out with CLR (calcium lime and rust), otherwise there are no repair parts.
Once the motor begins to slow, it overheats and burns out.
11 years is a good run, so you must have good water or are careful about your water softener.

http://waterheatertimer.org/Water-heater-recirculation-system.html
Using the timer and running Autocirc 1 hour a day costs between $11 and $17 per year to operate.
2 hours a day is $22-34 per year.
This includes pump operation and additional time that water heater operates.

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Jan 18, 2011 | Laing Thermotech Autocirc Undersink...

2 Answers

Where can I get the wiring diagram for the Laing Autocirc? I want to wire in a momentary switch so that when I am ready to get in the shower I hit the switch and the pump runs until the water is warm and...


If you have the same Autocirc product I have, then it cannot be taken apart. The timer seems to be connected and sealed together with the pump. If yours is different, answer back with the wires that you can see and we'll see if the timer can be by-passed.
http://waterheatertimer.org/Water-heater-recirculation-system.html

With the ordinary Grunfos-type pump that is not on a timer, you can add a switch and have the pump work on demand as you describe.

And they make a product that does the specific job you describe. It's called a Demand Pump. Link above shows two different types at page bottom.

I have not tested either Demand Pump shown. They operate on-demand ... when you activate the pump, the pump quickly brings water over from the hot water heater.

So the Demand Pump has a higher volume pump than the Autocirc or Grunfos.

I question a two things about the Demand Pump. 1) How will the increased pump pressure affect local pipes, especially supply tubes under a sink. 2) How HOT does the pump get? If pump gets hot, and it is located under bathroom sink next to paper goods, then that is a hazard. Some regional building codes don't allow ceiling light bulbs in closets because the bulbs get hot and start fires when people pack their closets full.

Oct 23, 2010 | Laing Thermotech Autocirc Undersink...

1 Answer

I have a laing cirulating pump thats is worhing but now making noise so i took it apart see nothing but it was hot when running so is there any thing i can do to fix before it burns out


Open following link for Re-circulation information and resources:
http://waterheatertimer.org/Water-heater-recirculation-system.html

If the unit is getting hot, it may have already slowed and is now spiraling to it end.
Try bleeding air out of water lines, and clean autocirc with CLR calcium lime and rust remover.
Recirculation systems have a built in check valve so cold water side of faucet will work correctly. If this check valve is stuck open or closed, it can affect a lot of things in the plumbing system.
For example, stuck check valve can cause tankless water heater not to operate. It can also cause autocirc pump to overheat.
Lines, or elbows clogged with sediment can also cause same problems with recirculation system. If your system has direct return line to water heater that connects into the water heater drain port, then clog in line can cause overheated pump. Check water flow, check water lines, and clean out autocirc.

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Oct 22, 2010 | Laing Thermotech Autocirc Undersink...

1 Answer

Pump runs 5 minutes and stops


Move the slide switch to ON.
Open following link for recirculation system resources.
http://waterheatertimer.org/Water-heater-recirculation-system.html

The recirculation can work on either the timer or the thermostat using slide switch located next to the timer dial.
First of all, look to see if dial is rotating as time passes.
Next look at position of slide switch. If switch is moved to 'timer,' then the timer controls the on-off function for pump.
Move the pins located on timer dial to control on-off times.
If the switch is moved to ON, then the thermostat controls the pump, and turns on until temperature in pipe reaches 94 or 100 degrees F approximately. I forget exact cutoff temp.

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Oct 11, 2010 | Laing Thermotech Autocirc Undersink...

1 Answer

NEED DIAGRAM ON INSTALLING UNDER SINK INSTANT HOT WATER CIRCULATING SYSTEM?


Open following link for Re-circulation information and resources, including diagram of installation and operation:
http://waterheatertimer.org/Water-heater-recirculation-system.html

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Sep 15, 2010 | Laing Thermotech Autocirc Undersink...

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