Question about Reddy R155D Utility Heater

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Runs only with cover off

R155A fires & runs with the cover off, pump pressure set to 4.2 as per specifications on unit

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  • FIXRUP Jan 15, 2009

    I CALLED REDDY PARTS AS I HAVE THE SAME PROBLEM. DESCRIBED THE PROBLEM AND WAS INFORMED THE PROBLEM IS A BAD PHOTOCELL. THIS UNIT SEES THE FLAME AND SIGNALS THE MACHINE TO SHUT DOWN IF THE FLAME IS OUT. A DEFECTIVE UNIT WILL SHU THE UNIT DOWN AFTER A FEW SECONDS. MY HEATER SHUTS OFF AFTER 20 SECONDS OR SO. YOU CAN GET THE PARTS AT WWW.REDDYPARTS.COM



    WHILE THERE, YOU MIGHT AS WELL GET THE FILTER KIT AS IT WILL NOT AFFECT THE SHIPPING COST. IF NOT, YOU WILL PAY AN EXTRA $9.60 WHEN YOU ORDER THE $14.00 PART



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Replaced rotor assembly


Posted on Jan 15, 2009

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I HAVE A MR HEATER 210'000 HEATER IT WILL ONLY RUN WITH THE TOP COVER REMOVED OR RAISED ABOUT AN INCH IF COVER LEFT ON IT WONT FIRE UP AT ALL OR IT WILL SPUTTER


This is typically due to Low Pump Pressure.
Check to make sure you input and output air filters are clean.
There is a filter under the black cover so make sure to check that one.
Turn the pressure up a 1/2 pound past manufactures setting and see if the unit starts after that with the hood having to be lifted.

Dec 22, 2016 | Heating & Cooling

1 Answer

Runs when started but won't stay running.


REAL FACT is: If all individual components of the heater are at 100% but the air pump pressure is not on it's mark, then the heater WILL NOT continue to run!
Air Pump Pressure is directly related to fuel delivery. Read that statement again! It is the most important line of text on this website.
If the pump pressure is incorrect, then, the fuel delivery will be incorrect. As a result, the heater will not run to specs.
Instructions for setting the air pump pressure:
Air pump pressure is the pulse of the heater. Pump pressures range from 3 psi to 6 psi depending on heater BTU size (see chart below). A loss of ONLY 1 psi translates to a 30% to 17% loss of FUEL FLOW (starvation). You must know the specified required pressure and set the pressure accordingly.
Heaters with Hot Surface Ignitor technology are extremely critical to pump pressure. If the pressure is off by 1/2 psi, the heater may run for 5 seconds, then shut down because of IGNITION FAILURE. The only way to correct this problem is to set the pump pressure to DESA's recommended pressure specification.
  1. The FIRST STEP in diagnosing any heater problem should be checking the output of the air pump. Determine the air pressure required for the heater model that is being tuned. The air pump, in turn, is responsible for fuel delivery.
  2. If you do not know the required pressure look for a decal on the side (usually) of your heater. This decal will state the model number, serial number, fuel capacity, pump pressure, etc.
  3. If your plastic end cover looks like this......
m29609t.jpgM29609 has 2 threaded holes. The hole on the left has a square plug inserted. Remove the plug. Screw in the nipple end of the gauge into the threaded hole. Check for air leaks with soapy water.
or
If your plastic end cover looks like this......
m16545t.jpgM16545 has 2 threaded holes. The shorter projection with a hole on the left has a square plug inserted. Remove the plug. Screw in the nipple end of the gauge into the threaded hole. Check for air leaks with soapy water.
4. The other hole (longer projection) has a screw with a hole which adjusts a ball and spring relief valve assembly. Carefully adjust the screw until the gauge is reading the pressure level that is specified on the heater's label. If operating properly, the pump should produce more pressure than is required to operate the heater. The relief valve allows the excess air to escape before being sent to the nozzle.
5. Replace plug. Test for leak.
6. If you are unable to reach the desired pressure spray soapy water around the seal of the end cover- at the same time check the plastic cover for a crack. A cracked end cover will not allow the heater to perform properly and will not allow for an accurate reading. The pump must be set at the specified pressure in order to have adequate fuel delivery an adequate fuel atomization. Replace if needed.
7. If you set the pressure to specs and the heater does not perform properly or the cone does not glow a soft red, then check for other fuel delivery problems such as a clogged fuel filter, cracked rubber hose, clogged or worn nozzle, or a cracked nozzle adapter. Soapy water lightly sprayed in these areas will quickly identify the problem most of the time. Any air leak will create problems.

Feb 13, 2014 | Reddy HEATER R70DT 70,000-BTU PORTABLE...

1 Answer

Died suddenly wont restart. turns over but wont fire.starting fluid made it start right up till it burned out then died again.fuel pump,pressure reg. ,filter?


Check for fuel pressure, 2.5 is Key on engine running
13 PSI (Pounds per Square Inch)

3.3 engine is 40-47 PSI (Pounds per Square Inch) Key on engine off
31-44 PSI (Pounds per Square Inch) Key on engine running

Jul 23, 2011 | 1991 Buick Century

1 Answer

I have a 1998 S-10 with a 4 banger. The problem is at times it just will not crank. It turns over fine but sometimes it just won't crank up. When it does this after several atempts sudenly it fires right...


The problem is your oil pressure sending unit this sound hard to belive but its true and its the problem. The fuel system works on a split circuit from fuse # 9 power goe's to the relay but also goe's to the oil sending unit as well and the sending unit is the place where the fuel pump is feed from the relay comes into the oil pressure sending unit. A nd the oil pressure unit needs to build up enough pressure from the oil pressure for the switch in side of it ot trip your is hanging up. So the power supply to the fuel pump is being interuped because it is comeing from the oil sending unit.

Jan 15, 2011 | 1998 Chevrolet S-10 Pickup

2 Answers

Dayton 70,000 btu kerosene heater only runs consistently with 3/4 of a tank of fuel or more. Once it is below 3/4 it keeps shutting off. I have cleaned filters, tried to set pressure but pressure won't go...


If you can only get 4 psi from the pump then you have a problem with the rotor. This could be from the vanes not coming out properly of if you have replaced or serviced the rotor you may not have the clearance set properly between the pump ring and the top of the rotor.
Make sure to inspect the pump cover for any small cracks..

If you pump pressure in not enough the unit will not be able to pull fuel from the tank and you will see the burner cone slowly start to go from the orange color to a dark color and the unit will shut down.

Feb 10, 2010 | Dayton (3E386) Heater

1 Answer

My 2002 bmw 530d turns over but refuses to start. fuel pump is working ok and fuel is exiting ok from filter to engine.


First, just because ther is fuel present, doesn't mean that there is enough fuel pressure present to fire your injectors. The fuel pressure specification on an M54 Engine is Bar 3.5 at a delivery rate of 2.25 Liters Per Minute. (or in U.S. terms, 51 PSI at 0.6 Gallons Per Minute) This must be measured with a gauge to make sure it is correct before determining if there is enough fuel, or is the fuel pump is working properly.

Second, did you check for spark at the spark plugs?

Oct 17, 2009 | 1999 BMW 5 Series

3 Answers

Reddy Heater RM60 HSI Forced Air Heater: Pump Pressure Issue!!


ground wire on the circuit board needs to be checked and these units need to have a GOOD three wire cord with a proper grounded outlet

Jan 21, 2009 | Reddy Heater-30-55,000 BTU Variable

1 Answer

R155A Reddy Heater Help!


This is going to be a tough one. You have been thorough, done it right, and it damn sure ought to fire off every time!

There is something that is causing you a problem and don't think that because you put in new parts that you didn't get a bad part. It happens. Not often, but it does happen. I have rec'd nozzles from the factory that had the orifice installed sideways, so, I know it happens.

If the ignitor glows- (it only stays on for 5 seconds, then quits)
If the fuel fogs (not sprays)
If the fuel hits the glowing ignitor
Then it should fire off-- every time.

Now, if the photocell doesn't like what it sees, then the photocell will shut the heater down within 5 seconds, but it at least should have ignited. Right? Unless the photocell or the board are bad. Maybe.

Lift the top, and watch. What's happening. Are you having a fuel problem or an electronics problem? For instance- is the ignitor glowing every time at start up or only sometimes.

Let me know what you find.

Jan 15, 2009 | Reddy Heater-170,000 BTU Kerosene Deluxe

1 Answer

Can not adjust air pressure to keep it running!!


Provided the rotor and vanes are serviceable the pump should produce around 10 psi if you completely close off the airline tubing. If your gauge will not read with the tubing totally restricted, then I would check the relief valve to see if the ball is in first, then the spring, then the screw with the hole. These items should be in the longer of the 2 bosses. If no pressure reading at this time you either have a broken rotor or a defective gauge.

If you get some pressure with the tubing restricted, but there is not enough, then use soapy water to find the air leak. If there is a crack in the plastic end cover- replace it.

How to set the pump pressure

Dec 11, 2008 | Reddy R155D Utility Heater

3 Answers

35000 reddy kerosene heater


My unit is a kerosene 35000 btu unit...just had similar issue.
It is very possible that the spark plug is
  1. fouled out (dirty)
  2. mis-gapped
take the top cover off, you will see the plug. There is a sheetmetal plate held on by two screws holding the ground, plug, and nozzle together. It is easier to just remove the plate (you will have problems with the plug nut if you don't).

remove the plug with a plug socket, probably 5/8.
I used brake parts cleaner to spray off the electrode of the plug then a wire brush to clean it.

check your plug gap...this might be crucial. my gap was specified on a label stuck on the inside of the bottom of the body. The plug on my unit was way too small. Adjust gap if necessary using feeler guages.

reinstall parts and plate. (I actually tack-welded the plug nut into place for ease of maintenance later). Note that the electrode needs to be a specific angle, relative to nozzle....probably diagrammed on the same label as the gap spec.

replace top and see if she'll fire up.

...last note...also might check your fuel pickup/filter. It is located behind the side panel in the unit

good luck...hope I have helped you


Dec 28, 2007 | Reddy Heater-30-55,000 BTU Variable

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