Your Door Is Ajar

The classic Dad joke: when is a door not a door? When it is a jar.

I know. Let it all out. The groaning and the moaning. All set? Feel better? Okay, let’s continue.

Today’s button is not really a button. It is a door handle. Simple enough. You can open and close the door. Lock and unlock the door. And there is also a deadbolt lock for the door.

That assumes, of course, that the door that Newmar installed works like a door.

It doesn’t.

Many Newmar owners have found themselves locked inside their own coaches unable to get the door to open. It happened to us a few years back. Another wonderful feature of these doors on some models? They can open. On their own. Unexpectedly. Like our awnings. This can bring a bit of excitement to those long, boring drives on the Interstate. “Sorry dear, it appears as though the dog has just jumped out the open door.”

Our door seems to prefer being locked. Even when we want to get out.

We had to learn the hard way that there is a specific protocol that must be used to avoid being trapped within our coach.

Curious to know the magic trick?

First the door handle.

The top latch is the deadbolt. As far as I know, it doesn’t seem to play a role in keeping us trapped inside our coach. The big handle is, of course, the door handle. It suggests that raising the handle will let you out of the coach. And it does most of the time.

Except for when it doesn’t.

The red latch underneath the door handle is the door lock. Sometimes the coach will automatically lock the door when it is begins moving. Not sure if it does that all the time. For example, at a fuel stop, I might pull the coach forward and unlock the door for Lorraine to enter — she usually goes back to pay the fuel bill as I clear the pump area. Sometimes it stays unlocked after she steps back in the coach and we start moving again.

But this one thing I do know. Never, ever attempt to open the door without unlocking it first. If you fail to unlock the door before exiting the coach it may cause the locking mechanism to get jammed which will prevent the door from opening.

This happened to us at a truck stop a few years ago. We pulled in to fuel the vehicle and Lorraine opened the door, assuming that regardless of the state of the door lock, it would just open. If the door was locked, it would unlock and open by raising the door handle. No need to push the red latch up.

Except it didn’t.

The door would not open.

We could not get out.

When this happened, we were really quite stunned. How could we be trapped inside our vehicle? What if there had been a fire at the back of the coach and we needed to get out of the front entrance door in a hurry?

This really poor door design means that if you pull up on the door handle when the door is in the locked position, the locking mechanism could get jammed and you will be stuck, unable to exit the door.

I suspect part of the problem is related to getting an airtight seal for the door. To do so you really have to slam the heck out of these doors. Ask any Newmar owner with a bit of experience. They know that these doors need slamming when driving the coach.

This door slamming technique triggers a secondary latching mechanism which holds the door tight to the frame. And that same latching mechanism can prevent you from getting out. The lock can get stuck in this locking mechanism forcing you to use some brute force methods to get the door to open again.

We spent about an hour on the phone with Newmar that day trying to figure out how to get out of our coach. At one point they even asked us to jump out the emergency door in the back.

No thanks. Getting in and out way back there would be a pretty big jump. No extended ladder for the rear exit was provided for our model year. That feature came in subsequent years.

Ultimately we called a couple of guys over from another fuel lane and with much pushing, shoving and pulling from both sides of the door it finally worked its way open.

The complete story from when it happened back in 2016 can be found here.

Seems a bit funny now. Didn’t seem that way back then.

How to use this door from the inside? Always unlock it BEFORE you open it.

The door does stay put once we are in transit. Only our awnings open unexpectedly now and then although hopefully that particular issue has been fixed now.

The joys of owning a motorcoach.

What Is That Little Red Switch?

I see this question come up frequently on the Newmar Facebook groups and on the Newmar Owner’s Forum on iRV2: what is that little red switch?

I have been posting a bit of a series on the various buttons, switches and controls on our Newmar coach, focused primarily on the more mysterious controls. Some are easy, some are complicated, some are just odd.

Today? An easy one. Mysterious yes, but an easy control.

Here is the little red switch at the very left of our front dashboard:

Newmar often ignores best practice automotive design principles. The switch is not labelled leaving the operator to guess at its purpose. No letters to hint at its function. No symbol to convey its purpose. But the choice of the colour red is an interesting one.

If you press the switch up, presuming the coach is running, the switch lights up. It becomes a brighter red switch.

Red is generally a colour that indicates to the operator that something is wrong. Or that you should stop doing whatever it is you are doing, like aimlessly pressing this particular switch.

If the red light indicates that something has been activated, you won’t know what that something might be as nothing appears to happen. Except, of course, that you made the red switch light up.

Perhaps using this symbol on or underneath the switch might have been helpful:

The defrost symbol is widely used in the automotive industry. Pressing such a switch will activate a defrost.

The little red switch in our coach? It is a defrost switch. The colour red must imply heat and its position beside the mirror controls, also unlabelled, could help the owner to recall its function in the future.

That switch activates the mirror heat.

Another mystery switch resolved.

What A Dump?

Today’s switch can be a bit of a head scratcher. It is labelled TAG DUMP. On our coach it has three options: AUTO, DISABLE, MANUAL.

Most Newmar owners leave this switch in the AUTO position because, like me, they find this switch confusing. To make it even more confusing, the way the switch is described in the Freightliner Chassis Manual is not consistent with the way the switch is labelled in the coach.

Here is the Freightliner rendering of the TAG DUMP switch:

This is what the switch looks like in our coach:

Two different switches. Freightliner describes the operation of the switch this way:

The tag-axle suspension dump switch is operated by a three-position, dash-mounted rocker switch. See Fig. 3.11. The manual TAG DUMP mode is activated by pressing the top of the rocker switch. The AUTO DUMP mode is activated automatically during reverse gear applications when the rocker switch is placed in the middle (level) position. When you depress the bottom of the rocker switch, the tag-axle suspension dump switch is placed in the OFF (down) position, and the TAG DUMP mode is inactive.

Unfortunately, that description does not match the switch that Newmar installed in the coach. When using the Newmar switch the middle position should disable the tag-axle suspension dump and depressing the bottom of the rocker switch should place the tag-axle suspension dump into manual mode.

What is this tag-axle suspension dump in the first place? On our coach we have three axles: steer, drive and tag. The additional axle, the tag axle, provides an increase in the gross vehicle weight rating. The TAG DUMP switch allows an operator to exhaust the air bags on the tag axle which, under certain conditions, may improve manueverability.

In AUTO mode, the tag axle air bags will automatically deflate when in reverse and when the speed of the vehicle is less than 8 mph. There may be certain situations where you might want to manually deflate the tag axle air bags. I have yet to run into such a situation. I always leave ours in AUTO.

There are numerous threads about the TAG DUMP switch on iRV2. This comment from one of the threads probably sums it up best:

This is an issue that has been discussed in this forum before because the description in the Freightliner manual does not agree with the way Newmar has installed it. The Newmar switch does not agree with the Freightliner description as the Newmar switch has 3 positions and the Freightliner only has 2 positions. In my experience none of the above descriptions are correct. The tag will always dump in reverse no matter what position the switch is in. The “off” position does nothing as this is not supported by Freightliner. “Manual” is a toggle switch. Press it once and the tag will always dump when your forward speed drops below 8mph. Press it again and it does not dump going forward.

A group of us had a long discussion with the instructor at Camp Freightliner about this issue and he was baffled that Newmar coaches had a different switch to what Freightliner had supplied. Just play with it and see how yours functions.

What Does That Switch Do?

So many switches. You probably have a few hanging around your coach that you haven’t fully explored yet. Like us. Three years into our current coach and I am still learning about the various systems. Today we will take a look at some switches found on the Oasis Remote Operating Panel.

In our coach, this is what that panel looks like.

Looks like Oasis elected to remove one of the switches and they were too cheap to run a different plate. We can safely ignore the ENGINE PRE-HEAT switch. We don’t have that one.

But we do have two other switches: BURNER and AC HEAT.

The BURNER switch is a simple off-on toggle switch. The AC HEAT switch is a three-way toggle switch.

Here is what the Oasis manual has to say about these particular switches:

Activating the Burner (Primary) and AC Heat (Secondary) from the Remote Operating Panel

Activating the Burner (Primary Heat Source)

The burner switch on the Remote Operating Panel controls the ON/OFF of the diesel burner (primary heat source). When the burner switch is turned ON, the diesel portion of the OASIS Heating Module will turn ON after ten seconds. The Burner LED will turn ON when the diesel burner has been activated. The burner will continue to operate until the coolant in the OASIS Heating Module reaches the set operating temperature range. At this point, the diesel burner will turn OFF. If the OASIS Heating Module coolant should cool down below this temperature range, the burner will again commence firing and will continue until either the burner switch on the remote panel is turned OFF or the temperature range is again achieved. If the burner switch on the remote panel is turned OFF, the burner stops and the OASIS Heating Module enters a two minute cool down stage prior to completely shutting down.

Activating the AC Immersion Element(s) (Secondary Heat Source)

Place the AC power switch on the Remote Operating Panel to either the one element or the two element position. The AC Heat (green) LED will turn ON indicating the AC element(s) are energized and the coolant is being electrically heated. They will continue to operate until the coolant in the OASIS Heating Module reaches the set operating temperature range. At this point, the elements will turn OFF. If the OASIS Heating Module coolant should cool down below this temperature range, the AC elements will again be energized and will continue until either the AC switch on the remote panel is placed in the OFF position or the temperature range is again achieved. If the AC element switch on the remote panel is turned OFF, the AC elements are de-energized and the AC Heat (green) LED turns OFF.

Activating the Burner and AC immersion Element(s) Jointly

Turn the burner switch ON and place the AC power switch on the Remote Operating Panel to either the one element or the two element position. The Burner and AC Heat (green) LED’s will turn ON indicating the diesel burner and AC element(s) have been selected.

Oh, and one other pointer a bit later in their documentation:

Activating the Domestic Hot Water

As long as heat is available in the OASIS Heating Module, the Distribution Module will respond to a call for domestic hot water. Ensure that a heat source has been selected (i.e. Burner, AC, Engine). The production of the domestic hot water is continuous on the Burner operation and limited when using AC or Engine.

All clear?

It took me a bit of research to understand when you might use the BURNER versus the AC HEAT and, for that matter, when you would use both.

Here then is how we use these particular switches.

If we are connected to a 50 amp service in cold weather and we want to heat the coach using the Hydronic heat system then turning the BURNER switch ON and turning AC I & AC II switch ON is our best option. Diesel fuel packs a lot more punch over electricity in terms of making heat. The AC I & AC II will reduce the draw on diesel fuel.

If we are connected to a 50 amp service in a mild to warmer climate, then turning the BURNER switch OFF and using AC I & AC II is usually our best option. Sufficient to keep the domestic hot water hot for light duties (e.g., washing hands, doing dishes). When we want to ensure continuous hot water, say for a long shower, we can turn the BURNER switch ON a few minutes before the shower and turn it off after the shower is finished. Keeping the BURNER switch OFF means less noise for our neighbours. Whenever the BURNER switch is left ON the diesel burner will periodically run. It is surprisingly loud. Especially at night.

If we are connected to a 30 amp service then turning the BURNER switch ON and using AC I is usually our best option.

If we are paying for electricity then we have to calculate the tradeoff between burning diesel fuel for heat against the cost of using electricity. In warmer climates we are likely ahead to use electricity over diesel.

What Does That Button Do?

Buttons. Switches. Dials. Your coach has quite a few of them, seemingly placed everywhere and sometimes placed randomly. We have them on the front dash, hidden behind cabinet doors, on the walls of the coach, buried deep within the basement bays, and inside the engine and generator bays.

Some of these buttons, switches and dials remained a mystery to me for years. Over the next week or so, I will unravel a few of those mysteries. Some were relatively straightforward to decipher. Others not readily apparent. Consistent with the RV industry code of conduct, most were undocumented or left to the owner to figure out.

Today, we will start with an easy one. Ready?


That is the label found on one of our many dashboard rocker switches.

For years, this rocker switch was never touched. I knew it was there. But I never knew why it existed.

We have three sources of heat for our coach. We have heat pumps mounted on the roof, we have heated flooring and we have hydronic heat. The heat pumps and the floor heat operate with electricity. The hydronic heat consists of loops placed throughout the coach. These loops contain a fluid that gets heated by the Oasis boiler using diesel fuel. And fans behind the loops blow air into the cabin. The air passes through the heated loops and distributes the heat. I thought that all of the fans operated automatically. One fan does not.

The heat pumps and the floor heat would never warm the front entrance of the coach. But the hydronic heat will if a fan gets turned on.

The HYDRN HTR FAN HI OFF LOW rocker switch controls the hydronic heater fan located under the front dash. The hydronic heat would need to be selected on our Dometic thermostat and then the rocker switch can be used to turn the fan on or off.

The hydronic heat source is not identified as HYDRN or HYDRONIC on the Dometic thermostat. That would make things too easy for an RV owner. Rather it is labelled on the Dometic thermostat as “FURN” presumably short for “FURNACE”.

Note the letter “R” looks more like the letter “P” with a dangling right leg. Gotta love the obsolete technology that Dometic is using to control the interior climate of our coach.

They could install thermostats like this one but the RV industry is so slow to innovate and embrace current technology.


Another button to be demystified tomorrow.