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Our RWB9 oil heater says lockout and is nt working

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2 Answers

Ignition is locked out unit will not fire


Turn it off at the black toggle switch inside the front panel or turn it off at the breaker for 2-3 minutes
Then try again.
Check that flow is good, gas is on ect...
Is it saying lockout on the display?
If not then as you fire it up after cutting power keep the panel off and watch the ignition control red diagnostic light.
The blinking sequence of that light should point you in the right direction. There is typically a label that will tell you what the blinks mean.
Minimax nt heaters are on borrowed time, and in most my Delong with them once they start having an issue it will never end , basically they are lemons and replacements for them is very common

Mar 28, 2015 | Pentair Minimax NT Heater

1 Answer

How do i reset the lockout


Push and hold the button for 60 seconds. It is in customer lockout because it was pressed more then 3 times.

Apr 25, 2014 | Honeywell R7184A1026 Electric Oil Primary...

1 Answer

Lighting instructions for oil furnace


Air in line. Prime and shut off power to unit at least 1 minute

Apr 24, 2014 | Honeywell R7184A1026 Electric Oil Primary...

1 Answer

Pentair MiniMax NT fan turns on then off after a minute or less. Flashing red light 3 times indicates Ignition lockout. How do I fix this? Thanks in advance


For some reason the ignition is not working or there is a gas supply issue. Best get a tech out to check it, these heaters are tricky.

Sep 10, 2013 | Pool & Spa

1 Answer

Model minimax nt std w/ddtc. will not fire up. code E04= fan failure. I can see and hear the fan running. It tries to fire twice then ignition lockout led flashes 3 times=ignition lockout. is there a...


FIRST ... CHECK YOUR FILTER !! IT MUST BE CLEAN ! THERE IS A PRESSURE SWITCH ON THE HEATER WATER INPUT LINE . IT MAY NEED TO BE REPLACED .. JAY.. THE POOL PUMP REPAIR GUY IN LONGWOOD FLORIDA

Jun 20, 2011 | Pentair Pool & Spa

1 Answer

Lockout light flashing for 1/2 sec.


Press down and hold the reset button. You may need to bleed the oil line once you get oil in the tank.

Feb 23, 2010 | Honeywell Heating & Cooling

1 Answer

No heating and hot water


sounds like overheat stat easy job to replace and do,nt cost the earth best of kuck

Oct 14, 2009 | Water Heaters

2 Answers

I have a Pentair MiniMax NT 250,000 btu pool heater that fails to


Two reasons.

1. There is air in the gas line. Power down the heater and allow it to try igniting until lockout. If it locks out, repeat the process. Most lines will clear within 4-5 attempts to ignite.

2. A plugged burner orifice. Run a small pipe cleaner in the brass fittings on the burner tray. They may have small webs in them restricting gas flow.

If the unit is a Standard (STD on the plate inside) it has a flame sensor that may also be bad. That sensor is on the end of the single wire that is cloase to the ignitor wire near the burners. Also check for a losse ground wire on the heater.

Nov 24, 2008 | Pool & Spa

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