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Polar V800 Barometer/Altimeter Replacement
Alexandre Moulart and one other contributor
Last updated on Sep 2, 2026
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Community-Contributed Guide
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Introduction
Go to step 1 ↓If the barometer/altimeter starts to behave erratically, you can start by following the basic troubleshooting steps recommended by Polar: altimeter calibration, watch restart, watch cleaning, cleaning the sensor entry (https://www.youtube.com/watch?v=pZslSi8h...), contacting Polar technical support (it is possible they may offer you a 30% discount on a new watch...)
If these steps do not solve the problem and in particular if:
- the watch freezes (the only way to unblock it is a reset) when you start a calibration
- no altitude information is displayed
then the altimeter may be broken.
WARNING, this is not an easy repair, you may make the watch unusable by attempting it.
What you need
Tools
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Spudger4.9
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Remove the eight, 7.4 millimeter-long screws on the back of the watch with a T5 head-type, torque screwdriver.
Ask FixBot
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Remove the nine, 4.0 millimeter-long screws with a T5 head-type torque screwdriver.
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Once all of the screws have been removed, lift the motherboard to expose the battery beneath motherboard.
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Gently pull the wires from their solder joints to disconnect them from the body of the watch.
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The barometer is visible inside the red circle on the photo
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Using a small flathead screwdriver or pliers, remove the red seal around the barometric sensor.
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The sensor is strongly glued and welded on the mother board. Beware of the micro components positioned nearby, avoid taking support on them when removing the seal.
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Unsolder or cut short the black/red wires soldered on the casing.
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A blue dot allows the good position/orientation of the component. Take note of the position of this dot prior removing the faulty component.
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Component ref MS580502BA01-50
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With a 350°C soldering iron and a desoldering wick remove as much solder as possible. Then try to remove the component with angled pliers
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It is likely that the component is glued to the board. In this case, the only solution that I've found was to remove the component by cutting it piece by piece with mini flush cutters.
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The target is to get a surface where to put the new component as clean as possible, while keeping the soldering pads and without destroying nearby components. That is the most complex operation.
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Put a VERY SMALL drop of glue (no superglue, use a glue that solidifies slower like epoxy so that you can correct misplacement of the component if it does not align with the solder pads) in the component placement area and put it in there (take care to place the component so that the blue dot is at the right position!)
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Solder the 4 contacts with a thin tip soldering iron. The use of flux will make the operation easier.
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Follow instruction in reverse order to assemble the device. Do not forget to resolder the black/red wires to the casing.
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