Hoover Oph 716Df Tripping Rcd When Pressure Sensor Connected
Our Hoover oph 716 Df has ddeveloped a fault which trips the electrics as soon as it's plugged in.
I have done tests including the heater element which is 27 ohms- normal.
The motor brushes are fine as is the mains filter.
After process of elimination I suspected the control pcb, ordered a second hand one but the same fault exists!
The only component left I have not checked is the pressure sensor- when I disconnect this the machine runs perfectly on every programme until I plug the sensor connector back in then it trips again.
It would appear to be the sensor but I have not heard of anyone else with this fault?
The wiring apoears fine and nothing else obvious including the door interlock.
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.
Hoover OPH 716 DF tripping RCD traced to heater element short to earth
- The problem
- Hoover OPH 716 DF washing machine was tripping the electrics as soon as it was plugged in. The fault seemed to stop when the pressure sensor was disconnected, which initially suggested the sensor or control circuit.
- Likely cause
- Confirmed fault was the heating element leaking/shorting to earth. Its resistance measured 27 ohms, which appeared normal, but there was continuity from the element terminals to earth.
- What fixed it
- The discussion confirmed the diagnosis was the heater element being at fault despite a normal resistance reading. The exact replacement step was not described, but the accepted conclusion was to identify the element as the cause rather than the pressure sensor or PCB.
- Checks to try
- Heater element measured at 27 ohms
- Motor brushes checked and reported fine
- Mains filter checked and reported fine
- Control PCB swapped for a second-hand board with no change
- Machine ran with pressure sensor disconnected
- Continuity found from heater element terminals to earth
- Parts or tools mentioned
- Control PCB
- Pressure sensor
- Heater element
- Continuity test meter
Safety: Do not bypass safety devices. Further diagnosis should be carried out by a suitably qualified appliance engineer.
4 Answers
Thanks for the update Bri, did you read my article on washing machine tripping or fusing electrics? It highlights the heating element of one of the main suspects.
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Well after scratching my head , I went back to my gut feeling - the element.
It is 27 ohms which is normal, however what I failed to notice was the continuity from the element terminals to earth! Explains why it was more likely to trip out when the machine was filling up. Hope this helps someone else.
I did not view the forums, mainly because I did not think the element was at fault, just goes to show do not overlook the obvious!
Thanks to your post I updated my article to advise it may be possible to detect low insulation using a normal continuity test meter. Previously I'd just advised you need a proper insulation test meter because a multimeter won't do a proper test (which involves pumping 500v DC) but if there is a direct short to earth a multimeter will pick it up.
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