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MANITOWAC IY0524A—alert, T4, starving txv, ice probe
HI- lucky me- I get to work on another ice machine. I go and find that there is no ice, an alert on the display and when I look at the errors- I find- T4 fault. Possible causes- cleaning, install, starving TXV, and ice probe thickness. Well its not ice probe- its not making ice. Its not install its been there 4 years. So I cleaned it- and it was nasty. At first when I saw the TXV I thought i had a leak- but its not- and I have no idea what the issue is with the staining and what appears to be a wet spot on the foam. There is no oil nor is it “wet”. Second- you can see the thermistor temps- I was going to change t3 and 4 because nothing in there is 300-400 degrees it says t3 is 275 and t4 is 395 degrees— when I touch them they are not hot- so they are not reading right or the board is bad. What would happen if I plugged t2 into t3s plug to see if the temp read normal? (for example). Lastly if you look at the pressures, low is like 135 and high is 280- I am also wondering if the compressor is bad. There is this constant buzz and I thought it was a contactor coil or something but its not—and coupled with the fact that I get no cold, I get this starving TXV message, and the pressures are crazy, the thought crossed my mind. First things first- I need to get these temps reading right- and then I can move onto step 2. I see in the parts list there is only one part number for thermistors- are they all the same? Thanks
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