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Vulcan cx90 Have a problem with my Ducted heater shutting down can someone tell me where the flame sensor is located

Posted by tony on

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harjeet singh

  • 86 Answers

SOURCE: vulcan cx90 ducted heater

240 volt wiring required.

Posted on Mar 17, 2008


harjeet singh

  • 86 Answers

SOURCE: Vulcan ducted heating

not possible

Posted on Mar 28, 2008

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Aruna Singh

  • 1555 Answers

SOURCE: My Vulcan CX90 ducted heater works fine other than

80 Series Burner Base. PART 1318011
Here is the complete listing
www.reece.com.au/new/pdf/products/Reece_Gas_Reference.pdf
The problem is that this part number is not available on net for sale.

Posted on May 23, 2010

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I have a Vulcan Ultra 21E ceiling ducted unit The LED flashing fault is no 8 which is a gas interruption. The unit fan runs, ignition starts full flame and gas flows for about 2 secs then shuts down The...


Just been thru a similar problem with my Climate Technologies Vulcan High Efficiency Ducted Gas heater which in this case is installed under the house. This heater is about 7 years old and I have previously (2 years back) refurbished the controller by replacing the main power supply electrolytic filter capacitors.

I also had a communication problem with the Touch pad Thermostat which in the end required replacing the entire touch pad as one of it's voltage regulators had gone intermittent (Touch pads are available on E-Bay). To operate the heater while the touch pad was out of commission I installed a manual switch between the heat contacts on the heater controller. Closing the switch causes the heater to permanently run if it has no thermostat. Once communication with the touch panel was restored we were able to try and find the intermittent heater fault.

Again I have been getting Fault Code 08 "Gas Interruption" however the heater was lighting OK and then going out after about a minute or so. In the end I found 2 distinct heater faults.

Fault 1 was the flame sensor where the weld between the wire and flame probe rod had broken but it was still touching. This meant it was sensing Flame OK and then later would go open with expansion as the temperature rose. I fixed this by replacing the Flame Probe with a new one sourced from Reece HVAC.

At this point I celebrated thinking it was fixed!

Fault 2 after the flame sensor issue was cleared the fault still persisted but slightly less often.
The heater was cycling 3 times to get going and then locking out, requiring a reset from the touch thermostat or heater controller board. Sometimes the heater would achieve a onging burn for a long period, and other times just locking out after 3 tries.

Careful observation of the flame, through the observation holes after it lit, showed correct flame sensing but as soon as the nominal 65C duct temperature was reached the combustion fan (modulates) throttles back too far and the flame goes out, the flame sensor switches off and gas valve is then closed. The pressure differential across the burner manafold controls the Gas flow rate so if the combustion fan goes too slow the flame goes out due to lack of gas.

On the control board there is a potentiometer marked "MIN GAS RATE" this needs to be tweaked clockwise until the burner remains lit when the nominal 60-65C duct temperature is reached. Don't turn it up too far or the heater may not throttle back enough and end up going out on overheat.

Once a stable flame is achieved when throttled, try the heater in the economy mode which uses a lower recirculating fan speed and check the flame still remains lit. My problem was most obvious in the Econ mode.

Hope this helps someone else - It took me over a year to solve this one. NeilP

Aug 21, 2011 | Heating & Cooling

1 Answer

My kerosene 50,000 btu reddy heater fires up for about five seconds and then shuts off. I put no. 1 kerosene in so it burns cleaner. It's 2/3s full. the drywallers used it last so it's a little dusty. ...


There is a sensor inside that tells the heater that the flame is lit...if it doesn't "see" the flame it will shut down...this may be caused by the filter in the rear being clogged and it is not allowing the pump to produce enough pressure to ensure a good flame or the pump inside may have sucked up some debris and is now not producing the proper pressure required. Another possibility is that there may be enough dust on the sensor itself to cause it to not "see" the flame...if you take the cover off you can find this sensor...it will have 2 wires coming off of it and it looks like a photocell...it should be located just in front of the jet where the fuel comes out...a word of caution...the ignitor(and the spark plug looking thing) have very high voltage on them(around 5000Volts) so I would avoid touching these parts while in operation.

Dec 08, 2010 | Reddy Heater 60,000 BTU Kerosene...

1 Answer

Burners on our Brivis Buffalo 52 Ducted heater aren't getting gas


test thermosat for proper operation ie-broken wire-power if good jump stat and check if unit goes on if it does than stat internal problem or wiring problem and needs replacement or repair --if stat good check fan safety/high limit sensor if good would need to check and test thermocouple thats the tube that the pilot flame burns on may be enough to keep pilot burning but not enough to open valve for heat demand

May 31, 2010 | Heating & Cooling

1 Answer

Torpedo Reedy heater 150,000 BTU starts & fires but after 2-3 minutes of heating , it shuts down, after it is off for about 3 minutes it will start & fires but then shuts down , each time it shuts...


There is a flame sensor inside the burner unit. The sensor is like a photo cell that must see the light of the flame or it will tell the burner control to stop the power. You need to see if there is a soot film on the lense of the sensor and make sure the sensor is aimed straight. If the sensor is clean and aimed straight (and the problem persists) then there may be a clogged nozzle that is giving a poor flame and the sensor does not see a good flame therefore shuts down the unit. If the nozzle is at fault, then you for sure need to replace the oil filter. New nozzles are $4-8 and the size & spray angle is stamped on the nozzle. If there is still a problem, then you need to see if the pump is giving approx. 100psi pressure, then finally (the last step) would be to replace the burner control $60. Goodluck< Macgivor

Jan 16, 2010 | Reddy Heater-170,000 BTU Kerosene Deluxe

1 Answer

Goodman GMNT 60 Furnace. Burners shut off after a minute and will not re-light. Board has one blink code says gas valve or flame sensor problem. Replaced flame sensor. Gas valve has a steady 24 volts and...


No, the board isnt out. The board has a code telling you that its out. Its your flame sensor. You wouldn't have gotten any heat if the gas valve was out. check if that flame sensor goes to another sensor on the same circuit , if it does check that. If it just a one wire sensor make sure its in the right position. If its a one rod flame senor with one wire I would sand it down with sandpaper. if its a two wire senor ohm it out to see if you ger current going through it.


www.fastacservice.com

Oct 16, 2009 | Goodman Heating & Cooling

1 Answer

Pool heater pilot lights, goes out when heat called for


No, that would just cause you to have huge flame. There is another high pressure switch located next to the flame sensor/ pilot genator that can cause this problem it is the size of a quarter and is screwed down with 2 phillip head screws

May 27, 2009 | Heating & Cooling

2 Answers

Rennai 551 FA-P Never fully shuts off


Hebert,

Is there a chance there is a draft around the room temp probe? It is down low on the right side of the heater. If there is a draft the room sensor is fooled and keeps running the unit. You should be able to prove the room sensor by putting your hand over it after the stove has been running for a while. This should shut the stove down. If not there is a problem with the room sensor.

Tom Hawkins
[email protected]

Jan 25, 2009 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

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