Delta Monitor 17 Ara temperature problem

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tinpanrally

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Hi all:
I had a Delta Monitor 17 Series showerhead/hand shower installed back in October 2023, with separate volume and temperature controls. It came with a Delta R11000 diverter and Delta R10000-UNWSHF mixing valve (with shutoffs).

I'm in Austin, Texas, with pretty hard water - lot of limestone. The shower's hot water over time got less hot and finally petered out altogether at the start of February while a friend was housesitting. I had a plumber come out and replace the cartridge, as well as bleed the lines a little bit. I unscrewed the showerhead and got a lot of sediment gunk out of it, then put it back on with some PFTE tape. The plumber siliconed the escutcheon back but had it crooked, and didn't seat the volume and temperature controls quite right. I believe they're both supposed to be pointed at around 5 o'clock.

I ended up breaking the temperature knob and cover trying to get everything re-seated correctly. Got replacements sent out from Delta but couldn't get the controls seated correctly again. In my attempts I blew out the new cartridge by trying to wrench the cartridge into place ("hot side" on the left) and off while navigating the shutoffs without the water to my unit shut off (I live in a condo complex). I gave up and had the original installer of my shower come out, and he can't get the controls set like they had been, either, and we're only getting either "hot to very hot" (like 100-130 degrees) or "cold to lukewarm" (60 or 70-95 degrees) as available options between where the temperature knob and rotational limit stops will allow us to set the handles. Before the hot water went out from accumulated scaling, I had a full range of cold to hot.

Both hot and cold shutoffs on the valve are fully open. Any ideas on what's going on and how I can fix it? Thanks in advance and very sorry to hear of Terry's passing away.
 

Breplum

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I've seen those cartridges installed without proper alignment of the "V" groove in cartridge to brass body.
Of course those plastic adjustment knobs are ripe for breaking, I've wondered how often they could break when popping off.
I'd remove cartridge and flush both sides from the service stops just to double check. The cartridges used to be able to be taken apart, the balancing spool removed and cleaned. Or call Delta, tell them your problem and possibly ask for another cartridge if they don't have a further solution.
 
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