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Boiler ok for hot water but no heating

Water fires up on demand but although Drayton controller turned on and thermostat all set to go with correct light sequence and temperature set the boiler won't fire up. help please!

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Hot water but no heating and the alarm button is flashing .

Posted on Jan 03, 2015

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What boiler do you have and is the controller a radio controlled thermostsat

Posted on Dec 15, 2014

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6ya6ya
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Posted on Jan 02, 2017

  • 659 Answers

SOURCE: hot water boiler will not ignite

Check all your limit switches on this unit. One of them is either tripped or bad.

Posted on Apr 07, 2009

gary1121
  • 332 Answers

SOURCE: a trickle of hot water from taps, central heating ok

it sounds like your shut off valve might be bad even though it turns on and off by turing it doesn't mean that the washer is not stuck to the seat and not opening, try replacing the valve

Posted on May 29, 2009

  • 150 Answers

SOURCE: alpha 240e boiler wont fire up for hot water, will for heating

most likely the diverter valve.. when hot tap turned on the movement of the water through the valve operates a diaphragm which pushes a pin/button//switch to tell the boiler to fire up

Posted on Sep 02, 2009

mrhotandcold
  • 248 Answers

SOURCE: Combi boiler will not fire up for hot water or heating.

check tops of spindles at radiator valves for leaks easy repaired set pressure to .8bar setting at 1.5 may be make overpressure and blow off through high/pressure releasese valve

Posted on Dec 03, 2009

  • 2 Answers

SOURCE: Worcester Bosch Highflow 400 Boiler - no hot water or heating

Normal 0 false false false MicrosoftInternetExplorer4 /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0cm 5.4pt 0cm 5.4pt; mso-para-margin:0cm; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} Hi, this is Worcester, Bosch Group

Although we don't currently offer live technical support online, our Technical Support department will be able to help. Their number is 0844 892 3366 - they're open 6 days a week and on average answer calls within 20 second. If you want to know more about our Technical Support department visit our website

http://www.worcester-bosch.co.uk/homeowner/customer-service/customer-technical-support

We look forward to helping you

Posted on May 17, 2010

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2 Answers

My boiler dosent come on i have no hot water but when i turn the heating on boiler works but still no hot water what should i do


Hot water is gravity fed through your pipes. When you turn the faucet on the water will flow through the pipes. If your hot water heater is natural gas driven relight the pilot. Same if oil fueled. If electrical, check fuse to see if it has blown or the circuit breaker has tripped. If either has tripped, replace it and if it blows again the heater has a serious failure, you might need to buy a new one. If pilot won't light on gas unit, try relighting after 5 minutes, could be a bad thermocouple.

Apr 03, 2015 | Water Water Heaters

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Boiler on hot water radiator system wont work


This is both a complex and dangerous system. There are many factors which can cause this. I will need more information. I will ask some basic questions... Was the thermostat changed out with the a/c unit or does it have a separate one? Did the gas valve get shut off? Did the breaker get shut off? Is the water on? They have low water lockouts. 99% of the time, it is where work was done. Did they hook up the stat correctly and establish the proper type of heat on the stat? Is the circulation pump on? Is the flame control board reset tripped? Leave feedback and we can go from there.

Nov 13, 2013 | Water Heaters

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I have an ariston 20/24 mffi combi pressure rises when switched to central heating but pressure ok when asking for hot water ? expansion vessel ?


over heat limit stat on central heating circuit ? if hot water is ok and hot to temp when run for 5 minutes the expansion vessel is doing its job.remember hot water is the maximum demand for any boiler ,,heating is secondry?once you establish hot water at maximum rate then the only real problem is on you demand for heating??

Dec 10, 2012 | Water Heaters

1 Answer

Combi boiler will not fire up for hot water or heating.


check tops of spindles at radiator valves for leaks easy repaired set pressure to .8bar setting at 1.5 may be make overpressure and blow off through high/pressure releasese valve

Nov 30, 2009 | Water Heaters

2 Answers

Alpha 240e boiler wont fire up for hot water, will for heating


most likely the diverter valve.. when hot tap turned on the movement of the water through the valve operates a diaphragm which pushes a pin/button//switch to tell the boiler to fire up

Aug 21, 2009 | Water Heaters

1 Answer

A trickle of hot water from taps, central heating ok


it sounds like your shut off valve might be bad even though it turns on and off by turing it doesn't mean that the washer is not stuck to the seat and not opening, try replacing the valve

May 18, 2009 | Water Heaters

2 Answers

No central heating back boiler


back boiler run from a gas fire? check the instructions to operate the gas heat to the back boiler not just the fire
I presume that this a fully pumped system - air lock doubtful There maybe on/off valves on the pipes to and from the back boiler [situate close to cylinder] make sure they are on - anticlockwise turn
or there could be a blockage in the outlet from header tank usually in the loft. or If there is no water in it maybe the mains cold feed it is off.
Note if no water in it DO NOT USE the back boiler

May 03, 2009 | Bosch & Power Vent Water Heater

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