Hobart sr24h detergent and rinse agent pumps not activating during normal cycling. Have tested pumps with external 120v and they both are operational. Relay?? Timer?? Wiring diagram?

This is a low temperature machine. So detegent and sanitizer go in together and the rinse aid goes in at the rinse cycle. At the lines in the right containers. It is pulling sanitizer at the rinse cycle?

Page 11 of the manual leads me to belive it may be priming. Do you have non return valves in the lines of all the product? Your lines should be full of chemical all the time with no air spaces.

https://www.hobart.com.mx/pdf/ManualOper/F38404%20man.pdf

Your detergent supplier, Hobart, Ecolab, Diversey will often help with issues like this for no charge. Don't let them play with metering though. That is an old trick to get the salemen more sales. ;>)
..

There are metering adjustments either inside the machine, or on the pumping unit on the wall. It is a known fact that rival companies will mess with other company equipment and then come along and say they can save you money on detergent and rinse aid.

Page 11 of the manual and elsewhere.

https://www.manualslib.com/manual/68346/Hobart-Ml-130021.html?page=11#manual

..

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

Yes, it has two pumps

Check the rinse pump. The tubing needs to come from the supply into the bottom of the pump, and the pump should be running clockwise. If the pump tube is worn, the rinse pressure will blow through the pump filling the bottle

Hello.
As per my personal opinion this is normal because for the final rinse you have a small booster or boiler..
When you turn on the machine..it starts fill and also the booster for the final rinse.
You start the machine..wash cycle...rinse cycle..
Now..new water(from rinse booster) is coming on the tank in order to rinse the dishes..on the same time the machine drains the excces water from the rinse(over flowing) and fills up the booster with new water.
Should be like this

Good luck

see the wirin diagram for test and see how to test:

Hello There; If your unit stuck on the wash cycle and not advance to rinse cycle because the rinse water is not up to 180 degree . You've to check out the booster element and the rinse temp. I hope this will help.

you have to go into program and activate the detergent pump.sounds like somebody deativated the det. program

If suds are detected continuously by the pressure switch during the drain or spin phases, the washer will fill 4 liters ofwater and during 5 minutes the unit will rest without tumbling, the water will be drained and it will try to spin or drain again.


Possible Causes/Procedure
If too much detergent was used:
Run the unit through a RINSE/SPIN cycle.
Run a NORMAL cycle without adding any detergent.
This should clear the unit of the excess detergent.

1. Check the drain hose and make sure it is not plugged or kinked.
2. Unplug washer or disconnect power.
3. Check wire harness connections to the drain pump, pressure
switch, and Central Control Unit (CCU).
4. Check/clean drain pump filter of foreign objects.
5. Plug in washer or reconnect power.
6. Check drain pump.
7. Check the pressure switch.
8. Verify CCU operation by running a Diagnostic Test or any Cycle.