0

upstairs radiator not working - all others are ok - valve on one end Therm controller on other - took a spanner to the valve and ensured open - still will not come on - what could the problem be?

  • Is the radiator on it's own pump? or part of a circulation loop using convection to move hot water? Have you tried bleeding out air that might be there? Very likely you have some air in there. Again, a few pics would help, esp of the connections. – George Anderson Feb 21 at 15:52
  • Is this a steam or a forced hot water radiator? – Carl Witthoft Feb 21 at 17:00
  • Hello, and welcome to Home Improvement. Unfortunately, we'll need more info before we have any chance of helping you. Please take our tour so you'll know how best to participate here. – Daniel Griscom Feb 22 at 14:19
0

Possible reasons:

Loss of heating water

  • Failing safety valves
  • Failing automatic air release valves
  • Tenants or house cleaners misusing (radiator breathing) valves as water supply

Leaks in the heat exchanger or pipe system, valves or radiators

Expansion tank

  • Incorrect pressure setting in air chamber
  • Failing membran
  • Leaks

Air in the system

Heating water circulation pump:

  • Stucked shaft
  • Failing phase capacitor
  • Turbine eroded by sand/rust/hard parts, cavity problems

Blocked (bypass/thermostat) valves, the tiny rods/shafts of thermo valves are prone for getting stucked

Input/output pipes of radiators/radiator valves mixed up

Blocked pipes (metal/rust parts/dirt)

| improve this answer | |

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.