One thing I rarely if ever see mentioned in regards to this issue is making sure that ALL water lines that might not be used are bled of all air.
In our Eagle TT, the washer water lines in our unit are not used. As we connect/disconnect the water lines, this introduces air into the water lines in the RV and at least some of it makes it's way into these lines.
Once enough air collects in those lines, it causes enough fluctuation in overall water pressure that our Girard will start running hot/cold/hot, especially if the water pressure coming into the RV is borderline or lower than 40psi. Once I bleed those lines, the issue disappears.
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2017 Jayco Eagle 330RSTS TT
2018 GMC Sierra Denali 3500HD CC LB SRW Duramax
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