Question about Dayton (4LX41) Heater

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DAYTON 4LX48 HANGING HEATER

UNIT WILL NOT STAY RUNNING UNLESS PRESSURE SWITCH IS JUMPED, AFTER IT IS JUMPED THE UNIT WILL RUN FOR 10-15 MIN. THEN IT WILL LOCK OUT ON HIGH LIMIT, FAN IS STILL RUNNING.

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Exhaust is restricted or crack in heat exchanger. Get someone to look at it!

Posted on Feb 14, 2008

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My Dayton heater will not fire up and tries to fire and then shuts down tries to fire and shuts down blows smoke out the end


Check noggle for dirt, check fuel filter for dirt. Check al rubber hoses for leaks, Set air pressure All these will cause it not fire.

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If I jump the pressure switch on my Laars Lite pool heater and the pump shuts off, with the high limit switch shut off the heater?


the other safety features will still work as expected. however, by bypassing the pressure switch, the heater will continue to run even if the water system is turned off. since the millivolt system requires no external power to operate, if there is a power outage, the heater will still run causing an EXTREMELY UNSAFE HAZARD. remove the jumper and do without your heater for a week.

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I have a hanging Dayton in garage pilot lights fine furnace fires up runs 6or7 min. then burner and pilot go out


Does unit fan come on ??? Is flue clear as most units have a safety klixon if exhaust not venting properly.

Nov 24, 2012 | Dayton Gas Furnace Heater

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I have a Dayton 3E437A furnace that does not activate the igniter or solen.


Try the flame sencor looks like a small rod this may need cleaning but if you jumped ou tthe pressureswitch then this will need to be replaced , check air filter is clean .

Oct 20, 2011 | Dayton Gas Furnace Heater

1 Answer

3e406d dayton gas heater will not ignite, limit is closed, power r to w, will ingite if direct 24v to module. jump g to r, fan will not come on. assume a relay (located inside bottom of burner are) is not...


it this a natural draft, or is if equiped with an inducer draft motor. would be the inducer is not coming on and closing the pressure switch. just a guess. need more info. does it flash any codes or is there even a board on it. is this a hanging unit heater or a standard upflow residential heater.

Nov 20, 2010 | Heating & Cooling

1 Answer

Have 30,000 btu Dayton heater m#3e3665 when reaches temp. fan


Hi blow heater out with air line flame sensor could be dirty check out pressure switch jump this out see if it lights

Feb 09, 2010 | Dayton (3E379) Heater

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My Dayton Gas Unit heater will not stay on. The


Have you tried the flue vent? If not, an easy way to check this would be to take the vent pipe off of the unit and see if it continues to have the problem. In most cases, this happens when you have blocked return air or dirty filters, flue blocked, or induction is blocked from switch or housing. One other possibility would be a dirty/clogged a coil which isn't allowing sufficient air to push out causing the limit to trip. I hope this helps somewhat.

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My dayton NG heater fan will not shut off properly


Sounds like a bad fan switch. The switch is located on the heat exchanger and is 110 volt bi-metal switch. Follow the wires from the blower going back to the heatexchanger. Graingers can get you a new switch if you give them your model number. www.grainger.com.

Dec 12, 2009 | Dayton Heating & Cooling

1 Answer

Heater keeps clicking off and on. won't stay running continually


May have a dirty pilot or bad pressure switch. Jump out the pressure switch (if it has one) and if it stays running, it's the switch. If it cycles still, you will need to clean the pilot assembly.

Dec 04, 2009 | Dayton Heating & Cooling

2 Answers

150,000btu Dayton htr (torpedo) lights, runs10 min fine, then shuts off


check for proper pump pressure. Restricted fuel flow. Proper venting of fuel cap.

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