Pump stopped working

check with laing site

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


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If the built-in check valve is bad, then circulation pump will not perform the job
http://waterheatertimer.org/Water-heater-recirculation-system.html
Unlike other brands, there is not a replacement crossover valve for laing

Gene

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Crossover valve went bad
There is no replacement part
http://waterheatertimer.org/Water-heater-recirculation-system.html

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Bad crossover valve
Crossover problem with single-handled faucet
http://waterheatertimer.org/Water-heater-recirculation-system.html

http://waterheatertimer.org/Crossover.html

Gene

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

Question not 100% clear.

1) The pump is not working? Does the pump make a noise? if pump is not working full-time, it can cause delay in arrival.
If pump motor is suspect, and outlet has power, then check override switch located on timer. Set override to Timer, move some of the trippers outward, then manually rotate timer dial until pump turns ON.
http://waterheatertimer.org/images/IMG_9325-grundfos-timer-800.jpg
If no noise is detected, or noise stops and starts, or seems strained, or if pump is hot, then pump motor may have burned out.

2) If pump is working, and makes noise like a humming sound, and pump motor is not hot, but hot water is not circulating, then unplug pump so it will not overheat and burn up.
Disassemble the pump and cross-over piece. Clean piping with white vinegar or CLR. Do not soak in CLR or it will damage seals. Rinse parts thoroughly. Reassemble and see if problem is resolved.
If pump is vibrating, then suspects include sediment and/or air inside line, and this can be resolved by cleaning as described. Also install air vent to increase life of pump.

3) Other causes for hot water delay at faucet are crossover.
Crossover can be caused by bad single-handled faucet cartridge, and/or by clogged-or-failed check valve on cross-over piece on grundfos.
This type of problem lets cold water enter hot line, and causes delay in arrival of hot water. Clean-or-replace the grundfos cross-over piece, and replace bad faucet cartridge.
Open following link for testing instructions:
http://waterheatertimer.org/Crossover.html

Resources:
http://waterheatertimer.org/Water-heater-recirculation-system.html
http://waterheatertimer.org/pdf/Troubleshoot-recirculation.pdf

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Grab a cap from the hardware store to stop it on the cheap. If it it is a brass drain valve you may be able to get away with draining the tank and replacing the small washer inside. Replacing the drain valve will be the ultimate solution.
Turn off the power on and electric or shut the gas valve to its off position.
Turn the water supply off above the tank or at the house main.
Connect a garden hose to the drain and open it all the way.
Open the safety valve on the top or side of the water heater to allow air in the tank so it will drain faster.
Unscrew the old drain valve with a pipe wrench.
Wrap plumber's teflon tape clockwise around the threads of the new drain valve and screw it into the tank by hand.
Tighten the valve with your pipe wrench until it is facing down at a 45 degree angle.
Close the safety valve.
Turn the water back on.
Open a faucet or two in the hows to let the air out of the tank while it is filling.
Turn the power or gas back on ONLY after the water heater it filled with water.

if you had a "pop" and lightning from the timer....
the water got into the electronics.
its time to replace.
getting hot.... was the cartridge either spinning dry, or spinning but not able to move water, did you have a valve off somewhere?
you might call laing or one of their distributors and see if its under warrantee.
where are you located, I can probably help you find a distributor.