Bosch washing machine tripping elcb
I changed a heating element in our Bosch washing machine about 2-3 weeks ago.
last night the elcb tripped and I narrowed it down to the washing mahine.
As soon as machine turned on elcb would trip. checked as much as possible saw no visible issue with elcb
disconnected control board all appears ok elcb does not trip.
Then I disconnected the element again all appears ok
Machine will function somewhat ( although no heating elemrnt)
checked resistane on element pins - measureing about 30ohms - good
Check for continiuty between element pins and earth - none - good
checked thermostat getting 0 ohms - although must admit - hard to measure
At this stage - Im lost - any ideas
Solution Summary
AI-generated from this discussion
This thread was marked as solved. Here's a summary of the problem and the fix, generated from the discussion below.
Bosch washing machine trips ELCB when powered, heater circuit suspected
- The problem
- A Bosch washing machine began tripping the ELCB as soon as it was switched on, around 2 to 3 weeks after a replacement heating element was fitted. The machine would run to some extent with the heating element disconnected.
- Likely cause
- The discussion supports an earth leakage fault as the most likely issue, but not a confirmed cause. The accepted reply says tripping can be caused by many faults and is not necessarily due to the heater. It also notes that a standard continuity check to earth is not sufficient to rule out heater insulation breakdown.
- What fixed it
- Use an insulation test meter to properly test for leakage to earth, particularly on the heater circuit, because an ordinary continuity meter may miss an insulation fault. The exact failed component and final repair were not confirmed in the thread. Further diagnosis should be carried out by a suitably qualified appliance engineer.
- Checks to try
- ELCB tripped as soon as the machine was turned on
- Machine did not trip with the control board disconnected
- Machine did not trip with the heating element disconnected
- Heating element measured about 30 ohms across its pins
- No continuity found between heater pins and earth using a standard meter
- Thermostat was checked and reported as 0 ohms
- Parts or tools mentioned
- replacement heating element
- insulation test meter
Safety: Further diagnosis should be carried out by a suitably qualified appliance engineer.
1 Answer
Fusing or tripping electrics can be many things so it’s not necessarily related to the heater. You wouldn’t expect a new heater go be faulty after 3 weeks. But when you checked continuity between the connectors and earth did you use an insulation test meter? An ordinary continuity meter would pick up a direct short to earth but you need an insulation test meter which puts 500 volts DC through to test properly as described here
https://www.whitegoodshelp.co.uk/washing-machine-fusing-electrics/
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