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Our Baxi combi 130 HE heats the water OK but will not heat radiators. This has happened after a period of not using the radiators (ie. over the summer)

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Check the Diverter Valve has not stuck due to internal corrosion. The body is available separately, about £60. Baxi Part No 247310

Posted on Jan 18, 2010

Check the pressure it should be in  the green band, check the pump, inside the boiler cabinet lower right.

Posted on Nov 06, 2008

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Posted on Jan 02, 2017

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Hi can anybody help,i have a vaillant combi boiler and i cannot turn the heating off on the radiators can anbody help cheers!


If you they won't go off when your timer is off. There's a possibility it's clock keeping it on although its turned off, which is fairly rare. However depending in which model of Vaillant you have, if your boiler has a hot water pre-heat on it. Some models which have this the diverter was prone for sticking thus leaving the port for the radiators open when in hot water mode.

Oct 03, 2013 | Heating & Cooling

1 Answer

We have a Worcester Bosch Highflow 400 (10 year old) combi boiler. Over the last few weeks when we have put on the heating the boiler kicks in and fires up and the heating comes on (the water comes on fine...


The by pass pipe may be limed up. This apparently causes a reduced flow which will stop the heating side of the thing working. Call out Worcester Bosch engineer. It costs £210 including VAT and most parts and they almost guarantee to get it working.

Nov 06, 2009 | Ruud Matching Split Air Conditioner

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Clock on comi boiler


it may be the preheat setting on the boiler for the hot water circuit. do the radiators get hot when the boiler fires up with the time clock off ? if not then there is nothing to worry about if it is only on for a short time.

Jan 04, 2009 | Heating & Cooling

1 Answer

I have a Baxi Combi boiler and want to add new TRVs to the radiators. Do I need to drain the system or can just turn off all the radiators and hope not much water escapes. How do I add new inhibitor...


You will need to isolate the boiler from the radiators because there is an auto feed valve that will continue to allow water into the system if the pressure in the boiler drops. There should be some valves off of the boiler that will allow you to do this.

Nov 07, 2008 | Heating & Cooling

1 Answer

My Worcester Bosch Greenstar Combi boiler digital display has started flashing the temperature then two half-rectangles alternately ... it is not heating the radiators to full capacity - any ideas?


just had same problem.  this apprently happens if the power supply has been interrupted or you switch the power on and off.
• The boiler runs for 15 minutes at minimum heat output to fill the condensate trap, the display (K) alternates between -II-” and the boiler flow temperature. This occurs every time the mains supply has been interrupted.

Nov 02, 2008 | Heating & Cooling

1 Answer

Vaillant Ecotec combi boiler - radiators working but no hot water flow to taps


David,

The fact that you're getting a little burst of domestic hot water suggests that the boiler is capable of circulating hot primary loop water through the heat exchanger, but doesn't necessarily do so when it needs to.

What seems to be lacking is a recognition that domestic hot water is now being drawn off, and that the boiler needs to fire up and divert the primary flow through the heat exchanger.

A good place to start might be the flow switch (usually in the bottom of the boiler, where the cold water supply comes in) or the electrical connections to it.

A.

Oct 05, 2008 | Heating & Cooling

4 Answers

Amana HTM (heat transfer module) system


I would check the house thermostat(and its wiring to the indoor unit), and if it's OK then check the heat transfer fluid diverter valve inside the indoor unit (should be sending the hot fluid through the big radiator (air exchanger)) until the surface temperature of the radiator is approximately 130 degrees F, then the fan control operates and the fan starts to blow hot air through your ductwork. My HTM is 26 years old and I've had many opportunities to "hone" its operation...

Feb 01, 2008 | Heating & Cooling

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