My boiler doesn't fire up the full burner when I request CH.
Read couple of posts on here and followed the trouble shoot in the manual. HW works fine, pump spinning, fan on/off after HW. Thought I'd isolated it to the CH temperature sensor. Borrowed my neighbour's Ohm meter and get 3.3 k Ohms accross the CH temp sensor (I get 10 k Ohms accross the DHW sensor). Trouble shooting guide says I should have >7 k Ohms at room temperature so not working right? but CH is a bit warm because the DHW had been firing up, so perhaps its not the CH temperature sensor after all.
Any ideas how I can rule it in our out? I'm worried it's a PCB problem.
Read couple of posts on here and followed the trouble shoot in the manual. HW works fine, pump spinning, fan on/off after HW. Thought I'd isolated it to the CH temperature sensor. Borrowed my neighbour's Ohm meter and get 3.3 k Ohms accross the CH temp sensor (I get 10 k Ohms accross the DHW sensor). Trouble shooting guide says I should have >7 k Ohms at room temperature so not working right? but CH is a bit warm because the DHW had been firing up, so perhaps its not the CH temperature sensor after all.
Any ideas how I can rule it in our out? I'm worried it's a PCB problem.