Hobart lx18 no power to detergent pump, during the wash cycle there is no power present at the connections for the pump, during the rinse cycle the sanitizer terminal will pulse power and the rinse aid and sanitizer pumps will run, is the relay board bad? With the top drawer open and running the led for detergent never lights up during the wash cycle.

Anyone who doses manually needs their heads looking at unless they only do one wash a day! :>D

LXi SERIES DISHWASHER - Hobart

https://www.hobart.com.mx > pdf > ManualOper
PDF
The Operator Programming mode allows changes to be made from factory settings to the chemical pumps' operation. This includes the Detergent and Rinse Aid pumps, ...
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Hobart LX18 User Manual - Page 1 of 28 ' Manualsbrain.com

https://manualsbrain.com > ... > LX18 > User Manual
Page 19MANAGER PROGRAMMING (Machine Must Be In READY Mode) To enter the Manager Programming Mode, you must first enter the Operator... Page 20PROGRAMMABLE ...

How do you check the programming on a Hobart Lx18h

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Dec 5, 2018 - How do you check the programming on a Hobart Lx18h dishwasher,,how do I get into programming to check booster heat.
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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. ;>)
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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

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Yes, it has two pumps

What type of detergent is not necessarily important - anything intented for use in commercial dishwashers should be sufficient. A restaurant supply store should have something suitable for you.
Also, in case you don't already know, the LX30C is the non-booster-heater version of the LX30 (LX30H has a booster heater). Without a booster heater, you'll need to use chemical sanitizer. The LX30C should, hopefully, have a sanitizer pump installed to inject chemical sanitizer into the rinsewater stream. Most of these dishwashers also have a detergent pump to inject detergent into the wash tank and rinse aid pump for chemical rinse aid.
If present, these pumps are located in the bottom of the machine. Remove the lower front panel (2 screws) and look for the small, black plastic assemblies with 2 hoses connected to each.

SUDS LOCK (OVERDOSE OF DETERGENT DETECTED DURING THE WASH CYCLE)

If suds are detected continuously by the pressure switch during the drain or spin phases, the washer will fill 4 liters of water 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.

SUDS LOCK (OVERDOSE OF DETERGENT
DETECTED DURING THE WASH CYCLE)

The motor control unit senses a suds lock condition by analyzing the
current draw on the drive motor. If “Sud” is displayed a potential Suds
Lock is detected. This may signify a bad pump, an extra heavy load,
excessive detergent, or excessive suds.

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.

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.

DPS1 and 2 are fed from L1 and L2 directly.
RPS1 and 2 get their signal from a relay, triggered during fill or rinse. Check inside the control box for the machine schematic and component location. Check that the relay only powers during fill and rinse. Check for welded relay contacts.
Note. Soap and rinse dispenses are often spliced into AM14's in unusual ways, and with unprotected pump circuits. (no fuses) These can be too much current draw for the contact rating of the relay.

it supposed to work throgh the washing cycle,therefore you better trace,and inspect the line of the detergent,maybe it'stuck somewhere,and if it's ok check the panel board.does the pump receive voltage through the washing cycle.