can you give me some advice on what to do next please?
seem to have a pump related problem.
I've tried to include everything - still bound to have missed something! - so please ignore the verbiage if the answer's obvious.
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System is mainly 30y old.
Gnd Floor: ideal mexico (2007) & timerbox(?) & 5rads with only manual controls;
Stairs: circular thermostat (set@20C)(2007);
1st Floor Airing Cupbrd: immersion tank & "grundfos multihead g" pump(2007) & 2xelectricpipeopeners(2011&2007) & electronics box(?);
1st Floor: 6rads with only manual controls;
Attic: small feeder tank with ballcock.
The system has never (1y) been able to handle the mexico at more than half power - boiler banged if turned up high, but upto half power it apparently worked ok (however rads had differing max heat even after balancing).
The other day I made the mistake of turning the mexico power way up. Bit of banging, then noticed the radiators were cooling. Turned everything off and waited til morning to repower. No go. Boiler regularly lights up ok but no sustained burn even tho cold day. No heat from rads. Tank water hot, but might be from previous night. Pump body becomes very hot but connecting pipes not so much.
What I've done
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Checked the timerbox controls actually cause the electricpipeopener slider controls to move - they do.
Tried to clear any water blockages: Tied up the ballcock, cleaned out the gunk in the tank, opened all the rad controls & vents and drained the system completely (except maybe one dstairs rad with seized vent). Water outlet runs clear towards end. Closed everything up, undid ballcock, added cleaner and refilled.
No obvious change.
Noticed pump was remarkably silent. Decide to vent pump. Undo pump central screw, bit of water, re-tighten.
No change.
Decide to take pump apart. Turn off elec & detach pump pwr cable; Close adjacent pump isolation valves; remove 4allen bolts; gently ease the pump housing back... unexpectedly (to me) leaving the stator apparently wedged solidly in the pipe. Aha! moment somewhat spoiled when the stator finally dislodged and I discovered the isolation valve(s) were also faulty.
Rebolted pump, changed clothes, drained system, unbolted pump, extracted stator, cleaned encrustation (and rust) from pipe&pump ends, WD40 and emery clothe to ensure free spinning, reassemble, rebolt, clean dulled pwr cable connections, refill, undo/redo central pump screw &bleed and confirm stator spins freely with screwdriver, bleed all rads (except 1), re-pwr and confirm live connection @pump.
No obvious change, beyond one radiator (the one that normally warms 1st) warming slightly.
seem to have a pump related problem.
I've tried to include everything - still bound to have missed something! - so please ignore the verbiage if the answer's obvious.
-----------
System is mainly 30y old.
Gnd Floor: ideal mexico (2007) & timerbox(?) & 5rads with only manual controls;
Stairs: circular thermostat (set@20C)(2007);
1st Floor Airing Cupbrd: immersion tank & "grundfos multihead g" pump(2007) & 2xelectricpipeopeners(2011&2007) & electronics box(?);
1st Floor: 6rads with only manual controls;
Attic: small feeder tank with ballcock.
The system has never (1y) been able to handle the mexico at more than half power - boiler banged if turned up high, but upto half power it apparently worked ok (however rads had differing max heat even after balancing).
The other day I made the mistake of turning the mexico power way up. Bit of banging, then noticed the radiators were cooling. Turned everything off and waited til morning to repower. No go. Boiler regularly lights up ok but no sustained burn even tho cold day. No heat from rads. Tank water hot, but might be from previous night. Pump body becomes very hot but connecting pipes not so much.
What I've done
--------------
Checked the timerbox controls actually cause the electricpipeopener slider controls to move - they do.
Tried to clear any water blockages: Tied up the ballcock, cleaned out the gunk in the tank, opened all the rad controls & vents and drained the system completely (except maybe one dstairs rad with seized vent). Water outlet runs clear towards end. Closed everything up, undid ballcock, added cleaner and refilled.
No obvious change.
Noticed pump was remarkably silent. Decide to vent pump. Undo pump central screw, bit of water, re-tighten.
No change.
Decide to take pump apart. Turn off elec & detach pump pwr cable; Close adjacent pump isolation valves; remove 4allen bolts; gently ease the pump housing back... unexpectedly (to me) leaving the stator apparently wedged solidly in the pipe. Aha! moment somewhat spoiled when the stator finally dislodged and I discovered the isolation valve(s) were also faulty.
Rebolted pump, changed clothes, drained system, unbolted pump, extracted stator, cleaned encrustation (and rust) from pipe&pump ends, WD40 and emery clothe to ensure free spinning, reassemble, rebolt, clean dulled pwr cable connections, refill, undo/redo central pump screw &bleed and confirm stator spins freely with screwdriver, bleed all rads (except 1), re-pwr and confirm live connection @pump.
No obvious change, beyond one radiator (the one that normally warms 1st) warming slightly.
