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Gas boiler will heat water but will not heat rads

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Sounds to me as if you have air trapped inside the system. If you have steam traps they may not be working. You probably need to call a tech to look boiler traps can sometimes be complicated, and steam if not controlled right can be very dangerous.

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Zerko

Posted on Aug 30, 2008

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1 Answer

Honeywell technical support


This boiler, from memory, has an electric diverter valve.
If the system has dirty (sludge/scale laden) water then the diverter valve may not return under spring pressure, and therefore not divert all of the hot boiler water to the hot water heat exchanger, leaving some going to the rads.
If I am right then the rads will not get fully hot.
If the valve has failed completely, or electrically, then the rads will get fully hot and there will be no hot water output (hot water will be cold).

Aug 19, 2014 | Heating & Cooling

3 Answers

MY VOKERA BOILER IS NOT WORKING I HAVE NO HOT WATER AND NO HEATING


try check in the water pressure on the boiler should be on 1.5 bar

Jun 01, 2010 | Heating & Cooling

1 Answer

Some of the baseboard heaters don't get hot. It is an old (1970) boiler system. Is there somewhere on each individual unit to turn it on? I'm baffled, I just assumed the hot water would run through all of...


Hi.
No the water does not have to run through all of them....if you have what is known as a mono-flo system.
With this type of system there are tees that divert some of the water to the radiator and some of the water bypasses and goes on to the nest radiator and so on....

If you look on the radiators that are not getting warm or any of the rads for that matter you will see a silver bleeder valve. Some of these take a "key" to open and some just have a screw driver slot.
If you open the beleeder you will probably get air out of the radiator. Leave the bleeder open till the valve spurts water out, then close it.
Continue this until all the rads are full of water.
If no air or water comes then your "fill Valve" on the boiler may be faulty and not allowing water into your system. You may need to replace that and then bleed the rads.....
Bottom line.... air does no heating, the rads must be full of water to make heat. Air in the rads also air locks that loop in a mono flo system...thus no heat...
Sometimes even after bleeding it can take sometime for the water to start flowing through a rad again... be patient...

I hope that this will help you to solve your problem!

Thanks for using Fixya!!

Heatman101

Dec 14, 2009 | Heating & Cooling

1 Answer

Heatslave diverter valve


clicking rads are due to pipe expansion when getting hot.
If the hot water [secondary circuit] gets hot and the boiler stays on [does not keep going on and off] even with a constant low water flow then the diverter should be ok.
there is a valve to prevent the primary circuit [central heating] [ CH] from sending water to the rads. this or its control may be at fault.
both the
Both the CH pipes to & from the boiler should have manual valves to turn off. do this then try the hot tap-full on. If the boiler goes into overheat mode and the overheat stat kicks in to turn the boiler off -- then :-
Check also the heat exchanger, it may be furred up especially if you are in a hard water area. It means taking it off and manually checking [pour water through] If you're lucky it will be just muck to be forced out with hose pipe pressure, if not a new one

Sep 06, 2009 | Water Heaters

1 Answer

RAds don't get hot anymore


rads not heating could be down to old system ie pipework etc and sludge building up. r there any cold spots on rads? when boiler turning off do u mean going to reset? if so could be over heat prob at boiler . there should be a pressure pipe coming from boiler going to outside if its a combi. if this is leaking your expansion vessel might need re charged as this is where the water will be going.

Feb 05, 2009 | Combi Centre DX - Mango

1 Answer

Baxi Boiler not firing, pilot light ok


first check the pilot is alight, it sounds like it is cause you can hear the boiler click. that click is the gas vale solenoid trying to open, if there is 240-230volts at gas valve when you here the click and pilot is alight the gas valve is broken. if you test for voltage look on the gas valve and see if its 240 or 24v obviously if it 24 v check for 24 volts, let me know

Nov 11, 2008 | Combi Centre DX - Mango

1 Answer

Boiler overheating


the problem there a relay stuck or thermostat bring on the pump & you can lower your high limit aquastat!! also the flow valves can bypass hot hot water risers time to put in a seperate water heater domestic coil are not energy efficient !!!! aquastat high limit set @ 180f deg low limit set @ 140f deg!!!
good luck!!! tim

Oct 08, 2008 | Water Heaters

1 Answer

My heating system is a Heat Line Compact gas boiler. When i turn on the boiler to heat the rads the pressure guage goes up to 5 and water comes out of the overflow pipe. Can you tell me what the problem...


Yes, your pressure is too high or your expansion tank is bad or the relief valve is bad. The water is expanding when heated and no place to expand too. I suspect the expansion tank. If you can get to it, tap it with a tip of a screw driver. It should sound hollow.

Sep 18, 2008 | Heating & Cooling

2 Answers

Ariston combi boiler


sounds like your diverter valve is passing on the boiler, this diverts the heat either to the rads or to the taps, if its passing through the heating chanel it'll heat up the rads- may also be a scaled up secondary heat exchanger, hope this helps you

Aug 21, 2008 | Combi Centre DX - Mango

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