Any ideas? I was doing a pm and had issues with reaching pressure and temp during cycles. Found a hole in jacket steam trap and a warn busing where the jacket rtd is inserted into plumbing causing a leak. Replaced both and calibrated temp/pressure (x2). Checked my PRV and the feed line a the top for blockage. Checked S9. Not sure what is going on.
Jacket not charging above 235deg
Is your supply pressure gauge starting at zero? Have you verified your steam trap and the defuser is clear? Verify S-9 is ok. Boiler is above 60psi while charging the jacket.
Was there a problem reported prior to pm?
what did you replace on pm?
Sounds like a condensate issue, did you replace the seat in the trap? Check valve after trap not stuck? Diffuser probably clogged, I normally break it off and run without it. Why did you calibrate? for certain you have a good cal on the jacket probe? I wouldn't point at the board just yet.
I'm guessing the original problem was "Jacket RTD failure" at the end of the sterilization phase of the cycle because there was too big a difference between the jacket temp and chamber temp, which is almost always a jacket condensation problem, which is almost always the steam diffuser below the compression tee where the trap ties to the water from ejector line.
I would also consider loading the previous RAW cal data from before your calibration unless you are 100% you've got an accurate value across a suitable span.
Does it have a boiler or are you on facilities steam?
If it’s on the boiler you need to check your heating element equal or about equal in resistance. They should be within about two Ohms of each other.
Otherwise there is something you missed between your steam trap, check valve defuser to the drain from the jacket or from the PRV to S9 to the jacket, blocked steam screen?
Occum’s razor applies. Back to the beginning. Easiest solution applies. Verify temp verify pressure.
Diffuser is logical. And a notorious and unnecessary pain in the a@@. Start there