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Reset Button Guide for boilers, furnaces, water heaters, oil-fired: here we explain how to find the reset button on heating equipment primary safety controls. And if you heating system has locked out on safety or "gone off on reset" we show you where to find details about the reset procedure. Here we explain how to reset the primary control safety switch if the cover-mounted plastic reset button has broken off.
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A "stack relay" is a primary heating system safety control mounted on the flue vent connector close to an oil fired heating boiler, furnace, or water heater.
The Type RA 116A or Type RA117A primary control is also designed to automatically re-start the oil burner after a cool-down cycle of a minute to a minute and a half after an abnormal shutdown. If multiple re-start attempts fail to get the oil burner operating satisfactorily the system will shut down entirely in "SAFETY OFF" condition.
Our sketches (above) of a Type RA 116A / RA 117A Primary Control, also called a Stack Relay or a Protectorelay, shows the cover removed and identifies the principal components of this heating system control. Sketch from Audel. This control includes a red safety reset button (shown on the gray rectangle and in the drawing, labeled "RESET") that pops out if the control has caused a safety shut down of the oil burner. Here we explain when, how, and how-often to press the red reset button to try re-starting the oil burner.
A gray box with a red reset button housing the stack relay and its reset switch will be found mounted on the flue vent connector if this control is in use. The first is simply to press the red reset button that protrudes through the cover of the stack relay box itself.
The primary control reset button on a Delco master control is labeled at the center right of the illustration at left. A primary control stack relay reset button is also pointed out by arrow #8 in our sketch above.
This red button should project through a small hole in the primary control's cover. If you don't see the red button but you see the hole in the control cover, it's possible that a plastic reset button extension has broken off and been lost, but the actual working reset button and switch can still be found inside the control cover and it can still be pressed.
Knowing how to reset the stack relay can avoid a costly no heat service call or it can keep the heating boiler running sufficiently to keep the building warm while waiting for the heating service technician.
There are actually two resets that can be performed on an oil burner stack relay.
A second stack control reset might be necessary - we discuss it at How to Reset the Oil Burner Stack Relay
How many times can I press the reset button on the oil burner primary controller?
Watch out: Most heating technicians and inspectors will tell you to only press the reset button once. That's because we worry that a homeowner will keep pressing the button even though the oil burner flame is never igniting.
Where Else Might I Find the Reset Button on My Oil Fired Furnace, Boiler, or Water Heater
You can see the "reset button" illustrated in sketch earlier on this page. Note: the "reset button" on some primary safety controls is actually a round red button protruding through the control cover. Usually when the control has locked out the oil burner, this button "pops out" to project further through the control cover.
Using a cad cell relay as a model we illustrate that the safety control red reset button may be a small (5/16" diameter) round plastic button protruding up through the control cover (below left) or it may be a larger round red rubber button such as the cad cell reset switch (below right).
Where the Heck Are The Various Reset Buttons on Heating Equipment?
If you are looking for the main reset button on heating equipment you'll want to see:
CAD CELL RELAY SWITCH (hot water boilers and some water heaters),
Stack Relay Switch on older oil fired boilers and furnaces,
SPILL SWITCHES (gas fired equipment), and
Low Water Cutoff Controls on steam heating systems.
At ELECTRIC MOTOR OVERLOAD RESET SWITCH we discuss the thermal overload switch and reset button that is found on many electric motors including those operating air conditioning fans, heating system oil burners, and furnace blowers and motors.
How to Use or Bypass the Cover-Mounted Reset Button on the Honeywell R8182 Aquastat Primary Control
On the Honeywell R8182 aquastat (below) the reset button protrudes through the control cover (green arrow below left). Pushing that red reset button through the control cover will in turn push the contacts on an actual electrical safety switch located inside the control cover (green arrow, below right).
In our photo (left) I've taken off the cover from the R98182 aquastat and I show its interior. I'm pushing the plastic reset button from the other side of the cover, and you can see how the button will protrude into the control by this action.
You can also see how elegantly simple this outer switch really is. Cast out of a single piece of red plastic, the narrow portion acts as a spring, and the "H" shaped portion is used to anchor the plastic button/spring assembly to the metal control cover.
Watch out: a heavy-handed button pusher or someone messing with the control cover can break off this red plastic "outer" reset button - but you can survive the problem as we explain here:
This "outer button pushing a switch button" is a nice detail to know because we have found a few safety controls at which the red plastic button has broken off and become lost. In our photo at below left, the orange arrow points to the hole where the red reset button should have been found on a different control - a cad cell. But the original construction of that cover was the same as my photos above.
Also see AQUASTAT TROUBLESHOOTING
More Examples of Missing Red Reset Buttons - on a Cad Cell Relay
Not to worry, you can still reset the equipment, but you'll have to remove the control cover to expose the actual electrical switch that you will see was located exactly under the hole in the control cover where that red button used to be.
On the cad cell the button might look like the one at above right, or more likely it will look like the actual electrical reset switch button assembly shown by the green arrow in our R8182 photos just above.
My photo at left shows how I'd push the R8182 aquastat internal reset button if it were necessary.
Watch out: if you remove the control cover to find the actual reset switch and its (also red) button, there is live voltage in there - you can get shocked or killed.
Some folks think of leaving the aquastat or primary control (cad cell or stack relay) cover in place and just pushing the true reset switch using a pencil, eraser end first, through the hole where the red plastic cover-bound push button has broken away. I just don't like sticking pencils or any tool into a control with its cover on - I'm not sure what it may encounter or damage.
Below we discuss other reset functions peculiar to the Stack Relay Switch, also called the Primary Controller on older oil fired heating equipment. But first we make a brief warning about puffbacks.
Watch out: There is a reason that instructions for a homeowner tell you to push the primary heating control reset button just "once". If you keep pushing it the oil burner will indeed keep trying to start, spraying more heating oil into the combustion chamber at each "try".
DO NOT keep resetting the system since doing so can flood the combustion chamber with un-burned heating oil - a dangerous condition as we just explained. See OIL BURNER SOOT & PUFFBACKS for details.
-- the above is paraphrased from Audel
Finding the Primary Control Reset Switch if the Red Button if It's Not Red
Just to make things tricky, on some controls the reset switch is black and even recessed, such as on the Energy Kinetics cover shown at left.
But other manufacturers know we're seeing red if we've lost heat - and most of them make the reset button red.
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