Bosch Worcester TDS 10

Questions and Answers

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epatrickAug 13, 2025
What to do if the Bosch Worcester TDS 10 Controller display is blank and the solar heating system pump isn't running?
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  Sheena OrtizAug 13, 2025
  If the display is blank and the solar heating system pump isn't running, even when the storage tank temperature is lower than the solar panel temperature, the cause may be no power supply, a blown fuse, or a defective power lead. In this case, have a qualified electrician check the electrical system.
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Margaret CochranAug 17, 2025
What to do if the Bosch Worcester TDS 10 solar heating system pump is not running?
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  Amanda SanchezAug 17, 2025
  If the solar heating system pump isn't running even when the storage tank temperature is below the solar panel temperature, it could be due to a few reasons: 1. The mode selector switch S is not in automatic mode. Set mode selector switch S to automatic mode. 2. The storage tank temperature is near or exceeds the set maximum. The solar heating system pump will restart once the storage tank cools down or enough water is used. 3. The solar panel temperature is above 130°C. The solar heating system pump will restart when the solar panel temperature drops below 127°C.
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laurachangAug 20, 2025
What does it mean if the Bosch Controller display shows a flashing red/yellow light?
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  pwatsonAug 21, 2025
  A flashing red/yellow light on the display of your Bosch Controller can indicate several issues. You should: * Check the sensor lead for a short circuit, especially the lead to the solar panel temperature sensor. * Ensure that the shut-off valves are open. * Check the system and bleed it if necessary. * Verify the solar heating system pump is working.
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Kevin FosterAug 25, 2025
What to do if the Bosch Controller solar heating system pump is humming?
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  Amy WillisAug 25, 2025
  If the symbol is moving on the display and the solar heating system pump is humming, it indicates that the pump is jammed. To resolve this, unscrew the slotted-head bolt from the pump cover and carefully free the pump shaft using a screwdriver. Important: Do not strike the pump shaft!
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Jill JonesAug 28, 2025
Why is the Bosch Worcester TDS 10 solar heating system pump not running even though the symbol on the display is moving?
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  johnsoncarrieAug 28, 2025
  If the symbol on the Bosch Controller display is moving but the solar heating system pump isn't running, the possible causes are: * A break in the connecting lead to the solar heating system pump, or the lead is not connected. Check the lead. * A blown fuse (SI, Fig. 10). Check the fuse and replace it if needed. * A defective solar heating system pump. Check the solar heating system pump and replace it if necessary.
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jmarksSep 1, 2025
Why is the domestic hot water too hot with my Bosch Worcester TDS 10 Controller?
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  Susan WyattSep 1, 2025
  If your domestic hot water is too hot when using your Bosch Controller, it's likely because the storage tank temperature limit is set too high. You should set a lower storage tank temperature limit.
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Carolyn PerezSep 4, 2025
Why is my Bosch Worcester TDS 10 showing an incorrect temperature sensor reading?
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  Sonia WarnerSep 4, 2025
  An incorrect temperature sensor reading on your Bosch Controller is caused by the temperature sensor not being fully inserted in its pocket, or excessive temperature loss at the measurement point. Push the temperature sensor all the way into the pocket and secure it. Add insulation if needed.
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hannah45Sep 8, 2025
How to fix domestic hot water not hot enough with Bosch Worcester TDS 10 Controller?
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  ryan67Sep 8, 2025
  If the domestic hot water isn't hot enough (or there's not enough of it) when using your Bosch Controller, the hot water temperature control on the boiler or heating programmer might be set too low. Adjust the temperature according to the operating instructions, with a recommended maximum of 60 °C.