Worcester Heatslave 15/19 OIL - Locking out!

15 Oct 2009
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United Kingdom

Hi all,

Can anyone please suggest anything I can next check regarding the lockout on our boiler?

It will lockout after about 8-10min when left off for 30min
If i then press the reset button on the control box it will lockout after 3-5min.

I have changed the solenoid coil on top of the oil pump (Danfoss 071N0010). This didnt help.
I have changed the control box (Satronic TF 832.3) Exact same...
I have checked we have oil.
It never locks out with an overheat needing the upper red button pressed
Its serviced every 6months. Filters changed etc.
Around 2 weeks ago the oil pump was replaced by a plumber (who is on holiday today)

Can anyone please suggest what I can check next? (before calling plumber!!)
Could the flooding/water somehow have caused issues?

Thanks in advance
Last edited:
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Thanks Terry.
There are 3 pins on the coil. Which am i measuring please?
Ive read, "it should be 2.7K when cold. Then run the boiler until it locks out and measure again. If no continuity, coil needs to be replaced."
I have replaced the coil already but will check if i can find out which of the three im measuring!
The two brass ones facing each other. 2,2k is about normal.
It will be a couple of K or o/c..... be quick or it may make contact again !!
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Thanks Terry,
Replaced the pump coil for another again and its now been up for an hour. Must have had a dud!
Really appreciate your replies.

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