Thanks Ira, will check n report back. So if transformer is dodgey, as the switch feeds heaters when not charged things would work as normal apart from not filling steam boiler. The transformer only supplies power to test the water level probe and logic circuits to fill steam boiler?.
On Wednesday, 9 January 2013 01:15:49 UTC, Ira wrote: > > At 12:23 PM 1/8/2013, you wrote: > > >Bending the board by applying pressure to the 4 connectors for the > >solenoid/headers is quite specific to that corner and it bends about > >the center line of the board. I don't think it's the switch as I've > >swapped it out and the fault is the same. > > The 100 ohm resistor is part of a circuit to protect the relay contacts. > > The autofill is controlled by the small parts at the rear edge of the > board, away from the connectors. A 14 or 16 pin chip, looks like an > LM324 and all those tiny resistors and capacitors. > > The part that tends to go on these is the transformer. If you've a > meter, check the output of the transformer when cold and warm, should > be 12 or 24 VAC, don't remember but probably 12. > > Also check the 12VDC out of the regulator for both 12V DC and AC near 0V. > > Measure between the hole in the tab and the outside pin of the TO220 > package in the back corner, marked IC1 on my spare. > > Across C1 should be 15 to 20V DC with a bit of AC to go with it. > > Ira > > -- You received this message because you are subscribed to the Google Groups "Brewtus" group. To view this discussion on the web visit https://groups.google.com/d/msg/brewtus/-/CKSgn26t8NMJ. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/brewtus?hl=en.
