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HTP VersaHydro Solar whining
I have a 4-yr-old HTP VersaHydro Solar propane mod-con boiler, and it has a loud whine in it periodically. The whine started a year or so after installation. A factory tech, myself, and a boiler pro all recently felt the whine indicated a bad blower fan bearing, so I replaced the blower fan. That was 2 weeks ago. All was fine for 3 days, but the whine started again. It only whines when the blower fan is in the range of 27-29% of the max speed. Also, the boiler will sometimes run quietly in that speed range. A week ago I called a factory tech and he said it sounds like another bad blower fan bearing, or a propane pressure problem. A pro is coming Tuesday to measure the pressure in the manifold as a starting point. Has anyone else had a similar whining problem? No one in my town works on these boilers, so any information/experience I can pass along to the pro will be appreciated, even if the same problem has happened to you on a different brand. Thanks in advance, and I hope I made myself clear. Puzzled in Fairbanks.