With no water in the tank, locate the float which is a low water safety. The temp probe should be directly above it. You can go on line to PartsTown.com and find the manual for this machine and on page 42 it has a picture of it and the location.
If m3 phase the possibility is for the motor to run backward depending on lead connections. If you replace motor wire it up and press contractor and close power contacts let go and observe motor rotation. If needed to change rotation switch lead 1 and 3. When I installed pumps I removed coupling to run motor..
Hobart LX30H ML 104354 Manual Page 28
According to the manual ... the wrench icon comes on with OTHER codes for the LX30. Did you get a flashing P1, P2 or P3?
Or for that matter, get any associated E codes to come up?
Depending on the P or E codes there are fixes discussed on prior Fixya answers for this machine ... search there for more help
E3 is low water level. This can be from a number of issues. Water pressure, fill solenoid, level sensor. Check these 3 to start, as its most likely one of them
