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Problems with Watchman Sonic Gauge? – Troubleshooting & Help!

No Signal on Sonic Watchman Gauge

From time to time the signal of the Sonic Watchman Signal can cut out. For example, this can happen in a power cut when the tank has been topped up or due to bad weather. This is indicated by an Exclamation Triangle with no bars displayed. First of all, it’s best not to panic this can simply be down the receiver plug losing connection to the gauge or alarm unit on the tank. The gauge will attempt to reconnect automatically.

Watchman Sonic Gauge Standard Warranty

The warranty period on a watchman oil level monitor is 12 months. In order to find out if your unit is still under warranty look on the back of the receiver for a 6 digit number. This can be found underneath the Part No. “A45-2817” is an example of what this might look like. The last 4 digits depict the month and year that it was issued. If the current date is within 12 months of that printed on your receiver then you should contact sensor@kingspan.com or call 028 3836 4415. Otherwise, we will be happy to help!

Troubleshoot Issues with Sonic Watchman

If the gauge does not reconnect automatically then follow these troubleshooting steps!
This means the Sonic Gauge will stop reading the oil level of the oil tank. There are a few simple steps to re-calibrate.

  1. Unscrew the green (or red if it is an alarm) disc the oil tank. Sync Watchman GaugeThe gauge will be located inside the lid on the inner tank if it is bunded.
  2. Take the disc to the white receiver which should be plugged into the mains in your home.
  3. Align the black dot on the right-hand side of the white receiver plug with the grey dot on the disc, the bars should start appearing one by one, once its flashing and beeping the sonic gauge has been calibrated. This can take 20 seconds so be patient. See Picture ->
  4. After the disc has been synced with the receiver take the disc straight back out and fix it to the tank.

Watchman Sonic Not Reading Correctly – How to update Watchman Receiver

If an incorrect level is being shown on your oil monitor then it’s worth checking that you have measured the height of your sensor against the tank correctly. 3 Metres is the maximum height for the sensor from the base of the tank. Make sure that you are only measuring the internal depth of the tank. Do not include the outer skin of bunded tanks in your measurement and take the measurement from no lower than the maximum fill level of your tank.

Change Sonic Battery: Battery model VARTA CR2430

Check first whether your Watchman Sonic Unit is in warranty or not. Opening a Watchman will void the warranty if it is still in effect.
The battery on the Sonic Watchman lasts for approximately up to 5 years. So it will eventually need replacing to do this follow these instructions:

  1. Switch off your Watchman display in the house.
  2. Remove the transmitter from the tank and take transmitter indoors, into a clean dry environment
  3. Using a cross point screwdriver, undo the four screws located under the main body of the transmitter
  4. Remove the top cover
  5. Flip out battery
  6. Clip-in the new battery
  7. Re-fit top cover
  8. Evenly & gently tighten all four screws – do not over tighten
  9. Replace the green or red disc on the tank
  10. Switch on Watchman display in the house and wait 5 minutes for the oil level to refresh

Where can I get a CR2430 Battery from?

Easy most online retailers will stock them. Usually, they can be bought fairly cheap here from Amazon

Other Error Messages:

Watchman Gauge Display Icons

Watchman Oil Monitor Flashing Triangle

  • Oil Tank Level Displayed with an Exclamation Mark in a triangle = Battery Low
  • No Level and an Exclamation Mark in a triangle = Transmission not Heard
  • 5th (middle) Bar lit with Exclamation Mark in a triangle = No Echo Condition

Historical Warning Indicators

  • F = Full
  • Red Light Flashing with no level = No Signal
  • Fluid level low & ‘’BAT LOW’’ = New power tube needed
  • C = Connection fault replacement needed




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