This is re-posting (5/10) of a problem I am having. The first posting said b-25 which is a misreading of a digital 6.
Ultra 155, TekMar controls, 8 years in service, 6-25 error code, outlet temp rise too fast.
The cause of the problem in the end was a bad temperature sensor. I replaced that and the error codes went away. The initial reason for becoming aware of the error code was a cracking sound coming from the boiler which was loud enough to hear upstairs, the boiler being located in the basement. That noise is still there after replacing the temp sensor. I am fairly sure that the cracking sound is a differential expansion (or contraction) between components of the boiler caused by a rising (or falling) temperature. This occurs at 175 degrees +/-. I have monitored the noises by waiting for the noises while holding a screw driver to various parts to feel the origin of the cracking sound. My best guess about the origin is the connection of the boiler water outlet to the house hot water supply. There is a compression fitting between the two. I have tried (very) slightly loosening or tightening the nut compressing the joint with very little lasting effect. The noise still exists and it is annoying but more importantly worrisome -too loud to be unimportant.
WM tech support was useful in suggesting the causes of the error codes, but not in locating the source or solution of the cracking noises.
Help!
Ultra 155, TekMar controls, 8 years in service, 6-25 error code, outlet temp rise too fast.
The cause of the problem in the end was a bad temperature sensor. I replaced that and the error codes went away. The initial reason for becoming aware of the error code was a cracking sound coming from the boiler which was loud enough to hear upstairs, the boiler being located in the basement. That noise is still there after replacing the temp sensor. I am fairly sure that the cracking sound is a differential expansion (or contraction) between components of the boiler caused by a rising (or falling) temperature. This occurs at 175 degrees +/-. I have monitored the noises by waiting for the noises while holding a screw driver to various parts to feel the origin of the cracking sound. My best guess about the origin is the connection of the boiler water outlet to the house hot water supply. There is a compression fitting between the two. I have tried (very) slightly loosening or tightening the nut compressing the joint with very little lasting effect. The noise still exists and it is annoying but more importantly worrisome -too loud to be unimportant.
WM tech support was useful in suggesting the causes of the error codes, but not in locating the source or solution of the cracking noises.
Help!