Hi all,
I'm in the process of flushing out my parents central heating system (using F3 cleaner for a few days, then flush clean).
A day into the clean, we noticed the bathroom and landing radiators were coming on intermittently.
The system is an old semi-pumped gravity system, with floor-standing boiler, and one zone valve by the cylinder.
This has happened once before (though not during a clean, etc). About a year ago, and my dad 'fiddled' with the zone valve, which seemed to correct the issue. The zone valve appears to be working OK - the lever is moving across/back OK. Though I haven't ruled it out as being behind the issue.
The boiler seems fine. I serviced it (I'm Gas Safe) a few weeks ago. The boiler isn't running continuously (just when there's a demand for heat or hot water). No particular noise in the system (ie, air). The boiler shuts on/off if you turn the thermostat knob up/down, so I presume the boiler stat is fine. The flow pipe from the boiler seems very hot.
Obviously, there's a surplus of heat, which is making it's way to the 'heat sink' radiators. But why?
I'll be draining the system down and flushing through in a couple of days, which may sort it all out, or not.
Any ideas most welcome,
Thanks everyone,
Jennie
I'm in the process of flushing out my parents central heating system (using F3 cleaner for a few days, then flush clean).
A day into the clean, we noticed the bathroom and landing radiators were coming on intermittently.
The system is an old semi-pumped gravity system, with floor-standing boiler, and one zone valve by the cylinder.
This has happened once before (though not during a clean, etc). About a year ago, and my dad 'fiddled' with the zone valve, which seemed to correct the issue. The zone valve appears to be working OK - the lever is moving across/back OK. Though I haven't ruled it out as being behind the issue.
The boiler seems fine. I serviced it (I'm Gas Safe) a few weeks ago. The boiler isn't running continuously (just when there's a demand for heat or hot water). No particular noise in the system (ie, air). The boiler shuts on/off if you turn the thermostat knob up/down, so I presume the boiler stat is fine. The flow pipe from the boiler seems very hot.
Obviously, there's a surplus of heat, which is making it's way to the 'heat sink' radiators. But why?
I'll be draining the system down and flushing through in a couple of days, which may sort it all out, or not.
Any ideas most welcome,
Thanks everyone,
Jennie