Model Number: WDT790SLYM3
Brand: Whirlpool
Age: 1-5 years

This dishwasher has been giving me problems the past year and I have corrected a couple of problems that were indicated by error codes.
First was 7-1 heater, so I replaced the heater element and that went away, however the next code to show up was 6-6 OID/temp. probe reporting
water temp low but wasn't so replaced OID so that went away. Now I have 8-1 slow drain and wondering if a bad/restricted water valve could cause
this or a restriction in drain hose or bad drain pump/impeller? Troubleshooting chart also says Check Valve in drain loop but not sure where that might
be located.
Any help/comments/suggestions welcome.
Thanks