20 Most Recent Amtrol ST-120V-C THERM-X-TROL ASME Expansion Tank, 68 Gallon Questions & Answers

So you get an E-3 error and nothing you seem to do corrects the issues, I had this happen to me once and what I found is that my boiler system side was working perfectly but the water heater took forever to recover and get up to temp causing alarms. What I did was take my Delta T across the heat exchanger and found that it was only 10'F meaning that the conductivity in my system was very poor. I decided to remove the heat exchanger from the boiler mate and found that the exchanger had sediment build-up almost 2 " think. Now imagine this, say you have a bucket of water and you throw a 300'F piece of metal into the water, naturally heat conduction causes the original water temp to rise Now say we take the same piece of metal @ 300'F and wrap it in a blanket, now the temp giving off 300'F originally is more like 90'F with the blanket over it. Throw the metal wrapped in a blanked into a bucket of water. Now ask yourself which will heat the bucket of water up quicker? Obviously supplying 300'F to the bucket of water will heat water up faster than supplying 90'F. this is exactly the concept of a fowled heat exchanger. You want to get rid of sediment (blanket) on the heat exchanger to make the system heat up faster and require less energy to get that water to a certain setpoint