halstead ace bolier lockout problems?

I am not a boiler technician but I can tell you for a fact your hot water going hot then cold is caused by the secondary heat exchange unit which is underneath your gas valve been full of shit. You can take it off with an allan key held on with 2 screws- 1 on top of gas valve and 1 at opposite end. Make sure you turn your water flow and return off under your boiler and also cold water mains. Clean it with caustic soda and it will sort your domestic hot water problem out. Droplets of water - ensure all 4 screws are in your diaphran housing as we had 1 missing and it was dripping out there. Lockout problem, check to see if your pressure release valve is leaking outside on wall. If it is you will have to replace it (£8 approx). Hope this helps

William
December 2009

Hi, I've got the same problem. the gas man says the whole boiler needs replacing. Have you resolved your problem?

Peter
October 2009