In a related questions answered by john224:
Actually, the clicking is likely causing the shaking. Inside the manifold of a H100 is a stainless steel diverter plate that send some of the passing water into the heat exchanger and lets the rest past and back to the pool. When it breaks, you will hear a 'clicking' noise at it rattles in the water path. When it breaks, the flow to the heat exchanger is intermittent and you will begin to boil the water, causing the shaking. This situation is dangerous, especially without a pressure relief in the heater or pipe. As long as your water chemistry is sound, Hayward will usually cover this under warranty even if the unit is over a year old. Contact them to get a factory authorized repair rep out at: http://www.haywardnet.com/locator/
What happens if this is not under warranty? Can I get the part myself and DIY it or do I have to get the whole heat exchanger? If the exchanger is the case, will it be too expensive to just replace that?
I have corrected two units with this problem. Disconnect the external piping fom the heater. When you look into the input and output pipingon the heater, you will see the loose metal plate. One unit was loose on both ends and the other on the output only. Make sure that it is clean and dry. Mix up some" JB Weld", a high temp two part epoxy and gluse the metal plates back into it correct position. After it cures (24 hours) reconnect the piping and it is good to go.
I've tried this repair and do you by chance know whether, on the inlet side, the diverter should be flush with the pipe, or whether there should be a gap allowing water to flow by? On mine, both ends were broken, and I want to be sure the diverter is in the correct location. Fixing the outlet end greatly reduced the problem (thanks!) but it still knocks some, and I'm not sure why.
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You can try to get a welding shop to tack it back in place (I do not remember who to credit for that but it was not my suggestion) and see if it stops.
The exchanger is expensive as a DIY part...about $350...but if that is all that is wrong it is a lot cheaper than $700+ for a whole new unit.
There are several things that can cause this symptom. If you have a volt/ohm meter and call the Hayward technical support at 908-355-7995
they might be able to help you figure this issue out. I hope this helps.
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