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Boiler comes on fan runs but no ignition. - Air Conditioners

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Bad igniter or bad gas valve. Try replacing the igniter 1st.

Posted on Aug 01, 2008

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I have installed honeywell aquastat relay per instruction manual on my dunkirk xeb-4 lp boiler furance with honeywwell ignition unit s8610u but it wont ever start the exhaust fan checked everything several...


If aquastat wirings are ok, and control module had been set up properly, the the furnace should start.
Check if bypassing the control the furnace starts, if it starts then check aquastat wirings.
If it depends on the furnace, check the valve, the safety sensor and the ignitor.
Here is the guide to set up the Aquastat control:
Guide to Setting & Wiring Heating System Boiler Aquastat Controls

Sep 13, 2008 | Honeywell Air Conditioners

1 Answer

Vaillant aqua plus combination boiler


First off, I'm not familiar with this particular boiler. I'm in the USA. I believe this is manufactured in the UK and may not be distributed here.
Second, and are you sure you needed to replace the blower in the first place?

Those questions really need to be answered before making any accurate remote diagnostics. This is a pretty complex piece of equipment with costly replacement parts. Some diagnostic and/or service work should be left up to a professional in your area if you're really not sure of what you're doing.

We all (or most of us) like to save money by doing our own repairs. If you feel confident about working on this further you can go to www.vaillant.co.uk to get manuals and service info online. This info will do you much more good than my guesses will. This unit has a diagnostic/control board that will display most faults if you know how to use it. I looked at some of the info online. They have pretty good stuff available to you if you know how to use it.

After all saying that, it "could" be the pressure switch not closing after the fan starts. You didn't say whether the new fan is starting or not. On a call for heat (or hot water) the fan starts (controlled by the main control board), the pressure switch proves the fan is running (and venting combustion gasses out of your home), it most likely has to prove water flow. If all the proving is confirmed, the ignition sequence will begin.....ignition, prove ignition, main gas valve opens, heats water, so on and so forth......

Now, if you still feel confident to work on this boiler, go to Vaillant's web site and read the manual(s). If you're not confident, call the heating man in your area. Just be careful with gas, electricity and hot water!!

I wish I could have given you more info to actually fix your problem, but I need more info as to why you changed the combustion blower to begin with. What WAS it doing? what IS it doing NOW and so on....

Good Luck to you! Let me know what you find out.

Bob
lainemech

Mar 18, 2014 | Air Conditioners

1 Answer

Ruud 80 plus furnace


Make sure you give it time. Gas furnaces ignite first and then the fan comes on. It will run for a while to heat the exchanger first. If the fan comes on with the heat it will blow cold initially. The fan also continues to run after the burners shut off to expel the existing heat in the ductwork

Oct 19, 2013 | Air Conditioners

1 Answer

Boiler won't light you here fan kick in then light comes up red on b can anyone help please?


First try to ignite the pilot light yourself. Instructions for igniting your boiler can be found in your boiler's manual or sometimes in the inside door of the boiler. If your boiler's pilot light won't ignite, you either have a gas supply problem or you'll need to call in a Gas Safe Register approved engineer for a repair.for details click

Nov 24, 2012 | Air Conditioners

3 Answers

Riello 40 F5 oil burner, on boiler, intermittently running


with a forced draught burner the fan motor would be checked via a pressure switch. if the pressure switch is not set correctly or the fan is too weak the contacts will not be made in the switch and the burner will lockout. if the damper is not open enough when the fan runs then the air supply will be too small for the switch to make. check to see if you have a capacitor on the fan windings if this is faulty then the fan will fail intermittently.

Jan 19, 2009 | Air Conditioners

1 Answer

Vaillant combi boiler problem


when the tap is turned on and the water light on the boiler doesn't this means the diverter valve is not operating it could be down to low water pressure in the house this can be checked at the cold tap in the kitchen. if there is plenty of pressure then it could be the diagphram in the diverter valve is worn or split. the diagphram is only a few pounds but it depends on the engineer you get as to how much money he wants to fit it.
the egg timer symbol (or two pyramids together) is an ignition indicator turn off and on again to see if it will fire with the tap running. reset the boiler with the lower right hand control knob.

Dec 31, 2008 | Air Conditioners

1 Answer

Ariston eurocombi boiler not firing up. Thermostat lights all on upto 80 degrees as if overheating. Pressure fine. No fan, no ignition.


The fault occured a few days after I altered the radiator layout and then refilled the system. Intially the boiler worked fine, then a few days later all of the temperature lights light upto 80 and the boiler would not fire. The pump was working but the fan was not. After diagnosing the electronics I came to the conclusion it was either the contol pcb or the temperature probe. As the temperature probe was the cheaper option I replaced that first. The system is now working again. I think this fault was caused by me failing to completly remove all air from the system after refill and an air lock occuring causing the probe to burn out.

Nov 26, 2008 | Air Conditioners

2 Answers

Riello oil burner RDB with red plastic cover at the front wont ignite. I've tried bleeding the valve. The motor seems to make an electrical humming noise for about 12 secs, then the system attempts to...


The motor should spin when the boiler is switched on. One end of the motor spins the fan the other end works the pump. The control box then starts the transformer that starts a spark. The control box then opens up the oil. The boiler should then light if any of the above or the boiler does not light, the boiler will go to lockout.
From what you say the motor is not spinning, thus it could be the motor or more like the pump.

YOU SHOULD NOT PLAY WITHE THE PUMP

If the wrong setting is made it could 1 burn out the back of your boiler 2 go to soot and the boilers in an hour would be filled up and become a fire risk. 3 not start at all if the setting is too low it is a fine line to get it to work and needs the right tools.

regards
oil eng.

Oct 26, 2008 | Air Conditioners

2 Answers

My oil boiler is a Danesmoor SLPJ 20-25 with an Electro Oil Inter 2011 burner. The oil tank ran out and after refilling the burner ran ok for approximately 6 minutes, the control box chattered and the...


you could have a problem with a temperature sensor.
it would not be the flame sensor since it could not wait 6 mins to sense that there is flame in the unit.
could be a temperature sensor problem where it is sensing a temperature which could be correct but it is sending a wrong signal to the controller to turn off the flame and start another cycle.

tnx 4 using fixya,

drcool

Oct 04, 2008 | Air Conditioners

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