Recently had some work done on my boiler (some o-rings replaced after a couple of small drips). The engineer noticed the rads weren't heating very well after this work and said some sludge may have dislodged and to try to keep running the heating with TRVs open to try and push it through.
Additionally, he said the thermistor was likely shot (said it's been firing between off and full power). Well, that was last week and the rads still aren't heating properly. I also just replaced the thermistor and it looks like the problem remains - it heats to 80c quickly, shuts off, then drops 20c every 15 seconds until it's down to 30c, then the flame comes back on again.
I'll probably look at running some inhibitor through it next, but I should note I've never had any problems with the rads not heating in recent years, despite having periodical work done and drained the system a number of times. Just wondering if it could be anything else?
Additionally, he said the thermistor was likely shot (said it's been firing between off and full power). Well, that was last week and the rads still aren't heating properly. I also just replaced the thermistor and it looks like the problem remains - it heats to 80c quickly, shuts off, then drops 20c every 15 seconds until it's down to 30c, then the flame comes back on again.
I'll probably look at running some inhibitor through it next, but I should note I've never had any problems with the rads not heating in recent years, despite having periodical work done and drained the system a number of times. Just wondering if it could be anything else?