When I turn on the RLH4C laser level all lights flashing no rotating laser

The flashing "Hold" light in a 2001 Ford Laser automatic transmission indicates a potential issue with the transmission. It's a warning sign that there may be a problem that needs attention. Here are some possible reasons for the flashing "Hold" light and steps to take:

1. Transmission Overheating: The flashing "Hold" light can be triggered by the transmission overheating. This can happen if you've been driving in heavy traffic or in hot weather. If this is the case, you can try the following steps:
   • Pull over to a safe location.
   • Shift the transmission to "P" (Park).
   • Allow the engine to idle for a few minutes to cool down the transmission.
   • Turn off the engine and wait for a moment.
   • Start the engine again and see if the "Hold" light remains off. If it does, it was likely caused by overheating.
2. Transmission Fault: If the "Hold" light continues to flash even after restarting the engine, there may be a more serious issue with the transmission. In this case, it's advisable to have the vehicle inspected by a qualified mechanic or a transmission specialist. They can diagnose the problem and recommend the necessary repairs.
3. Transmission Fluid Level: Check the transmission fluid level as low fluid levels can sometimes trigger warning lights. Consult your vehicle's owner's manual for instructions on how to check the transmission fluid level. If it's low, top it up with the recommended transmission fluid.
4. Transmission Sensor or Solenoid: The flashing "Hold" light can also be related to sensors or solenoids in the transmission that may be malfunctioning. A diagnostic scan of the vehicle's computer system can identify any error codes related to the transmission, helping pinpoint the issue.

It's important not to ignore a flashing "Hold" light, as transmission problems can worsen if not addressed promptly. Continuing to drive with a malfunctioning transmission can lead to further damage and potentially costly repairs. Therefore, it's recommended to have the vehicle inspected by a professional to determine the cause of the issue and take appropriate action.

If you have the standard RL-H3C then there are 3 buttons. Starting from the left there is the "height alert" then "manual" then "Power".

Height alert is a function that after the laser levels and spins monitors the position of the laser. If the laser moves more then a tiny amount then the height alert function is tripped, and the laser flashes it's lights and stops spinning (or spins slowly) to let you know the base line position of the laser has changed. Pressing the height alert button twice shuts this mode off.
Manual mode means after the laser is leveled, it completely ignores the level vials. You can turn the laser any way you want to and it will always spin and not cause any errors.
Power is self explanatory.
If it's a RL-H3CS then it has two arrow buttons, that when in manual mode, allot one axis of the laser to be manually adjusted up and down to do a manual slope.

There was a problem with the LL400/GL4X2's where the system would level, but not rotate. It is usually intermittent. There's an op amp on the keypad board that sends the power to the head motor. This component fails, and the board has to be replaced. It's can be pricey if it's out of warranty.
There are a couple other things that it could be, as well. Like the screws holding the motor in place have come out and the motor is no longer in contact with the rotating head. Or something in the head gears. But usually the keypad.

There is no "calibration mode".

To check calibration set the tool on a fixed surface. turn it on. let it autolevel, then mark the wall with a pencil at a distance of 15- 20 feet. rotate the laser on its axis 90 degrees, and see if it self levels to the same line. if it does not, send it to hilti, you'll have it back in a week.

I have one of this model too and have the same problem. It spin and spin but won't level. After a couple of minutes it stops and the power led fast blink.

Hopefully it's the simple answer. The bubble vial may be out. start where the level vial says is level, and move outwards in slow circles to try and find a place the laser thinks is level. if you find a spot, use the 3 adjustment screws on the bottom of the bubble vial to make that your new center.
Otherwise, it's a not good news. A couple things could be gone wrong. The oil bath compensator could have leaked. If you open the laser, and it's oily inside, throw it away.
It could be the peep site could need adjusting, or the laser diode could be blown. If the laser diode is dead, same solution as the compensator leaking. There are no parts available for these anymore, chuck it out.
The peep site isn't a write off, per se. The laser operates by shooting the beam through a oil bath, which compensates for the instrument not being perfectly level, and then through a splitting lens. part of the beam travels up, and through the rotating head. And the rest goes through a peep site, to a light reflecting area of the main circuit board. if the board or peep site is no longer aligned, the laser will never think it's level. The bad news about that, it is a very tricky and time consuming repair, that few technicians know how to do, or if they do know how are most aren't comfortable doing it.
You can try taking the cover off, leveling the instrument, powering it up and trying to move the circuit board until the laser thinks it's level, but i wouldn't waste much time on it.

When the tool is level, the lasers will stop flashing, but check out the batteries too, because if they're weak, the tool will not level, and the lights will continue to flash .

Sound like the laser diode is failing. It's power is likely just strong enough to get the level position right, then dims as it runs. The unit, no longer seeing the laser, decides it's out of level and stops. Or the oil in the compensator is leaking, and the same process is happening. Unfortunately the replacement part is not economical to replace.

Most likely what's happening is the laser spins and it will level to the front corner, then the far back corner, then back to the middleish, and rotates at a slow speed, and error lights flash, right?
Couple things can cause this. First, the compensator uses an oil bath to decide it's level position. It shines the laser through the oil, and a detector sees the reflection and moves up or down to adjust the reflected beam to the center. If either the oil has leaked, or the laser diode has failed, the sensor will not see the beam to level. If you open it up, and it's oily inside, the compensator has definitely leaked. Laser and oil bath compensator are 1 part, not available anymore. Chuck it out.
If not oily inside, there's a small circuit board on the side of the compensator that is plugged in to the circuit board below. This is the leveling sensor. I've been told by another technician that unplugging this connector, and plugging it back in after 30 seconds or so can bring them back to life. I've never had it work, but I always try.
Last thing it could be is the encooder/encooder wheel. on the back of the compensator there is a small sensor that is right below the rotating head. There is a picket fence sticker on the underside of the head. if the sticker is worn, bubbled or damaged, it may not be picked up by the encooder. or the encooder may be faulty. The head gear/encooder wheel assy is still available as it's used in other units. you may still be able to get the encooder too, they changed them part way though production, depends on the version you have.

make sure batteries are tight in unit ,making good connection there are many internal things that could be wrong no rotation could be bad drive motor broken belt bad pcb robotoolz now owned by bosch who owns cst-berger discontinued robotoolz lasers there is a guy who will give free estimate on repair A.P. Service & supplies 610-944 8030