Question about Taco 1/2" 006 BC4-TAC Circulator Pump/ Timer /Aquastat

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I cannot figure out why my hot water no longer gets hot. I unplugged my timer 3 years ago and never had a problem. Now, no hot water unless timer is on and circulating.

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Best solution is to remove the circulation-system crossover located under sink and see if problem is solved.
After removing crossover piece, try hot water tap.
Another way to check if this is the problem: Turn off cold water shut-off located above water heater. No need to turn off power or gas to water heater. Now, no water should flow when you turn on hot water tap because hot is turned off.
Open hot water side of double handled faucet. If water still comes out the hot side, then crossover is the problem.

After removing Taco crossover, you can still have the problem if a single handled faucet has the same type of crossover issue.
Repeat test to see if water comes out of hot side when water to water heater is shut off.
If water still comes out of hot side, then put ear against each single handled faucet and see which one has sound of moving water. That will narrow down the suspects.

Posted on Apr 10, 2011


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Let's break it down.

1) Water heater tripped:
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See WH40 wiring illustration at following link:

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