probably blocked secondary or primary heat exchanger, as the fault generally occours in hot water demand
leakster
February 2009
Hi according to the manual it states to check the main pcb connections. I am having this problem and can find no obvious reason. I am reluctant to purchase a pcb before excluding all other possible causes. I would appreciate any suggestions thanks
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix home heating systems.