Hobart SR24H dishwasher will not spray, arm does not rotate

Full parts list here, but from my 52 years in the hospitality trade, Hobart washers need professional diagnosis and repair. Your unit has a 'Chemical Detection Box', but only the engineers will know how or what it detects.

also see page 6, items 17 and 18, and 20 Timer Relays. Part 17 is specific to detergent and rinse, so replace that first.

CTRL+F shows the machine has 7 relays
https://www.hobart.com.mx/pdf/CatPartes/F43078RevA_Lk.pdf

..

Check water pressure, check valves, unscrew connection at the unit and check for debris screen that may be clogged. If that does not work then you are looking at troubleshoot the actual valves to see if they have failed or are having a power issue.

ONLY YOU CAN CHECK THE WATER INLET

SR24H

Hobart are commercial machines so require commercial chemicals. Companies like Johnson diverse and ecolab are the usual favourites, but wherever you buy your cleaning equipment from will have a brand they can sell you. Most companies also provide and setup automatic dispensers with their chemicals. Find a supplier and ask them what they can do for you

Hello Jim Richards,

I tried to pull down... any meaningful information
from the GARDEN VARIETY part houses...

It appears you can get replacement parts through grainger...

Manualslib.com does indeed show SR24H
a commercial grade unit...
(also SR24C... similar chem clean commercial grade)
Hobart SR24C Instruction Manual Page 4
Hoping to find valves, schematics & perhaps
even PART NUMBERS... (no luck).

Found some parts on the internet...

Parts list (Rev A, August 2009)
http://www.hobart.com.mx/pdf/CatPartes/F43078RevA_Lk.pdf

I don't know if you have tried to "activate" the valves
(power direct to... VALVES not responding = open coil)

Or you are having a control board failure
(test for voltage present)...

If you have power at the valves... and they are merely not responding... Some folks will tell you to clean the
(descale.... decalcify) your VALVES.

I'd say replace them... NOT CHEAP
(but it appears "KITS" might be available)
then play with the old ones at your leisure...
(obviously... if that I indeed your issue)

Grainger.com might help (but not obvious on the net)

Heritage parts, WhaleyFoodService and Partstown
(appliancepartspros was a COMPLETE BUST)
see below
https://www.bing.com/search?q=hobart+sr24h+parts&form=EDGEAR&qs=PF&cvid=dc8dfce20e70486cbcb3a4149b58c984&cc=US&setlang=en-US&PC=DCTE

Whaley
Parts Manual HOBART SR24H

May be the water inlet valve.The screen could be clogged or the valve itself may be bad.

hobartcorp.com under service tab click parts then smart parts system tab