Which valve is being used? Most of the Otis units I've seen have been Maxton. When the pump runs are your coils energizised? Is there a call registered. I know this is basic but I don't recognize the model # you posted.

viscosity is what you are looking for

BYP or most likely US is out of adjustment

If this is a 211 equvalent ..is it a new install?? I would back out US all the way (ccw) and count the turns if you want to return it ..if that doesnt do it you will have to adjust bypass ..

Remember there is no UP valve(i've never came across one). Oil pressure pushes the ball valve up, that allows oil to flow thru the main hose. The bypass allows the pressure to build enough to elevate the lift under a constant load. What sort of drive is it? Star/delta? Soft start vf? All of these is a factor and most of the time you can change the parameters to suit. It does however sound like a bypass issue but it could also be a hot oil issue. You should be able to tell if you have a oil heater or block heater as send the lift to the top floor, open the tank lid and check inside. If the there is a long cigar shape thats an oil heater. If you check the terminal block you should be able to desern the wiring from the valves,thermisters etc and what ever is left might also be a block heater.

All in all, it does sound like a bypass issue. Hope this helps.

Sounds like you need to resize your valve. Adjust byp and us on valve. If soft stop oil additive has ever been added to the oil to help out dry packing it will change the viscosity of the oil and thus cause your elevator to leave door zone while on viscosity.

maxton uc4a inside the tank has two sensor that is connect to blue box rem 2. with oil heater. motor startet is wye delta. no call no direction, no valve open. my question. Do you think this elevator come w oil warmup system that start the pump unit to bring up the temp. this comtroller is prior 211.

crpelev

You may want to turn the power off and put a pressure gauge on. Then close the line at the tank. Watch and see if you loose pressure. If you are loosing pressure it could be the ball cage not seating properly. A seal kit will put you back on track.

If that all looks good try this. Pull a lead off for ULVS. Turn the power back on and open the line up. Run the car up to see if it moves. Also check your relief pressure. If it moves and your pressure reading looks good! Maxton should have a written BPS adjustment procedure for you. Good luck and work safe!

Sccjr is making a valid point! Maxton suggest that if BPS is in fully and the car does not move you MAY have the improper size valve!

Thank you all.

That diagram is definitely not a 211..more likely an old HOCL.Lrv2 or LRS2

..gotta agree with E311..check your bypass..car is moving when it is not supposed to be...