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I need a on off knob for A HD80A workforce heater and safety valve

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Posted on Jan 02, 2017

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SOURCE: I'm looking for the external control knob for Workforce HD80A propane area heater.Where can I purchase the parts?

Maybe thru the manufacturer

Posted on Dec 15, 2015

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Hi my vulcan gas hot water service isn't getting hot enough anymore? please help me?


check first if you have good water flow to and from heater. lift pressure release valve on inlet and allow few sec to flow, same with outlet hot water safety valve.

remove front cover from the heater, you should see your gas connection and thermostat knob.

check if gas is burning evenly and on whole surface, check for leaks on the heater and on the lines to and from the heater.

if you did not find any faults, no leaks, safety valves work correctly, check thermostats settings,

wind it down to minimal, then turn it to about 1/4 value (you did not specify model but this should do, widening arrow or numerical values ar self explanatory), lift hot water safety valve for few seconds, then open any hot water tap (faucet if you are an american...) and check if gas ignites and burns.

set thermostat to about 2/3 value and again, lift hot water safety valve for few seconds, then open any hot water tap. check if gas ignites and if water is sufficiently hot, if too hot - wind it down to say 1/2 way, if too cold, wind it till resistant and then back off a bit, DO NOT EVER LEAVE VALVE OR THERMOSTAT ON MAX!.

if none of these help - you need either, change the thermostat or heater itself.

if works - you solved the problem, close the tap, close the cover and use the system as you normally do.

i am always recommending use of insulation on the hot water system, it saves heaps of money over the life of the system.

hope this will help you - do not forget to vote... :-)

Apr 09, 2015 | Water Water Heaters

1 Answer

Heater ignites when holding knob in as soon as you let go flame goes out so basicly it wont stay lit


safety interlock is not being disabled. Older types have a mercury filled bulb flame sensor, newer types have a thermocouple or millivolt sensor. Diagnose and repair the safety shutoff interlock, when the flame heats up the sensor the gas valve should keep the flame lit on its own.
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Feb 23, 2015 | Heating & Cooling

1 Answer

How to light a pilot


Turn the knob on the gas valve t the PILOT position. Press down on the knob so that gas can get to the pilot. Light the pilot. Keep holding down the knob till the thermocouple gets hot enough to hold the safety magnet open and keep the pilot burning. Then move the knob to the ON position. Once that is done raise your thermostat setting till the heater comes on then adjust according to you comfort and party on Amigo!

Oct 27, 2012 | Heating & Cooling

1 Answer

How do you turn the pilot light back on? This is an older model, probably about 10 years old or so.


Move the gas valve knob to the PILOT position and press down on the knob. You will be pressing down on a spring loaded safety magnet. Now light the pilot and keep holding down the knob till the thermocouple gets hot enough to produce electrical current and hold that spring loaded magnet in. This is your safety device. If the heat gets too hot the furnace has a fuse in line with that magnet.
When the pilot stays lit by itself without you having to hold down the button then advance the knob to the ON position. Then go to the wall thermostat and turn on the heater.

HOW IT WORKS: WILLIAMS WALL HEATER

Nov 11, 2010 | Williams 6508732 Gas Heater

1 Answer

Pilot will not light


Unable to light pilot Gas supply turned off Turn on gas supply Gas **** knob dial not positioned correctly Check lighting instructions. Set control knob Defective thermocouple Check and replace thermocouple Defective safety magnet assembly Check and replace gas valve Pilot burner orifice clogged Clean or replace Pilot tube pinched or clogged Clean, repair or replace Poor thermocouple connection Check and tighten Air in gas line Purge air from gas line Thermostat's single use ECO is tripped Check ECO and replace gas valve Gas valve defective Check gas valve

Jun 06, 2010 | American Standard AMERICAN STD 100G NGAS...

1 Answer

I go thru the process of lighting the pilot light following the directions exactly, but as soon as I let the pilot light switch pop out so that I can turn it to the left to light the heater the flame goes...


The system works off of a thermocouple that is heated by the pilot. The thermocouple creates millivolts that magnetize a head behind the control knob. When you push in the knob the magnetized head behind the knob holds the gas valve open. So obviously the head is not being magnetized. First make sure that the pilot is not plugged and the flame is large enough to heat the thermocouple. Also sometimes you may need to hold the knob for several minutes before the pilot will stay on. Also patio heaters have a safety feature that will cut the millivolt circuit if the heater falls over. It is possible that this safety device is tripped or defective causing the pilot to not stay lit. Also check for any loose wires on the millivolt system.

Dec 21, 2009 | Endless Summer UniFlame (GWU501E) Open...

1 Answer

Torpedo heater lights and runs with control kknob pressed in but shuts down when control knob is released.


Change the thermocouple. The thermocouple scenes the heat from the pilot lit and signals the main gas valve to remain in the ready condition. The main valve will not receive the signal if the thermocouple is bad and will revert to the safety shut down when the control knob is released.

Nov 20, 2008 | Dayton Heating & Cooling

1 Answer

Patio Heater pilot lights won't stay lit


crappy pilot flame (not properly heating the thermocouple), bad thermocouple, thermocouple loose where it screws into the pilot safety valve, bad safety valve magnet.

One or more of those is the problem.

Oh...there is also a saftey switch...in case it tips over. It will also cause the pilot to not stay lit (if the switch or wires that go to i are faulty)

May 30, 2008 | Coleman (5040B750) Patio Heater

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