The water coming out of the Amtrol WHS80Z indirect water heater is lower than 100 degrees even though the temperature was set to 130 degrees. I also noticed that the boiler water temperature rises to over 200 degrees when the water heater is turned on. However, if I turned off the water heater, the boiler water temperature stays at 180 degrees even though multiple zones of heating are on. If the water heater is turned on, all the heating zones are shut off as priority was set to heat up the water heater first, but the water never reached 130 degrees. When the water heater is shut off, all the heating zones are back to normal. So it seems the fan relay is working properly. What are the possible reasons that will cause the water not reaching the set temperature? Maybe it is purely coincidental, this happened right after the sprinkler guy turned off the sprinkler system. He blowed air into the sprinkler system to clear out the water.
I have a couple of thoughts. You may have air in the boiler water circuit at the loop that feeds the tank. You'll have to find the vent in the loop to get it out. Second, the automatic valve that opens for hot water may not be opening fully. Have you felt both the boiler water lines that go in and out of the tank? If the water going in is hot and the line out is very cold you have very little boiler water going through the loop. Make sure the isolation valves on the loop are open. Is your boiler full of water? If the boiler loop lines are hot going in and coming out, the tank is full of rust or debris and no water can get to the fins on the internal tubing to pick up heat. If that's the case there is no repair and its time to get a new tank. Hope this helps good luck.
SOURCE: not enough hot water. I have an Amtrol Extrol coil water heater
Since you mentioned 'both temperatures' it seems your unit is like most all of them, a lower and upper coil.
If your hot water supply runs out quickly, this normally means that the lower coil has failed.
Since heat rises, the upper coil will never supply a tankful of hot water, just hot to start, and then as the flow continues, it doesn't have time to do more than warm the water flowing into the tank.
Every home should now own a simple digital multimeter; they cost less than $20 US everywhere and one can find them in auto parts stores, electronic supply companies and tool companies.
If you have a Harbor Freight tool store in your area, you can get them for under $10 US any time and sometimes even less:
Digital meter
You need to be absolutely certain that the voltage to the water heater is shut down.
Before you measure anything else, set the meter to its highest AC setting and check across the coils and then from either contact to the metal housing.
If it is dead everywhere, then set the meter to the lowest Ohms scale (normally 200).
The resistance of the coil should be nearly the same reading as when you simply short the meter's probe tips together.
If it measures 'OL' then the coil is open and must be replaced.
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