My 2019 Anthem has a factory installed Wabasto heater that isn't working. I have watched videos and read instructions on how to turn the heater on. It has heated twice and then only for five minutes. I even had a Mack mechanic try and he wasn't able to get the heater to fire up. No codes from the digital side and the green light is on. Looking for suggestions or fixes.
Mack Anthem Wabasto heater not working
Discussion in 'Trucks [ Eighteen Wheelers ]' started by Gentlemanfarmer, Nov 23, 2020.
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I had a loose clamp on the fuel line after the fuel filter. Fuel was pumping out onto the ground instead of into the heater.
No codes, controls looked normal. -
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Try replacing the fuel filter. I had the same problem on a 2020 KW and that fixed it.
Gentlemanfarmer Thanks this. -
If the heater is not turned off and allowed to go thru shut down cycle properly. If ignition switch turned on and heater in a fueling cycle it will flood burner chamber and raw fuel will saturate chamber and at next fire up it will cause excessive smoke and a no start issue. Glow pin will possibly fail from a small explosion in burner chamber. Then what usually happens is the heater gets cycled repeatedly by impatient operators who don’t wait for start and shut down sequence to complete and more fuel fills the chamber. Check fuel pump mounted to one of the fuel tanks. Check if it’s clicking, if so pull the nut on inlet side of pump from tank and look at fine mesh filter, can clean with brake clean etc. Probably looking at a new glow pin, atomizer screen and some patience. Thermo king sells a kit along with the 12 or 14 mm socket (don’t remember exactly) for glow pin removal. Socket has a slot cut to allow for the wires. Can make one yourself from cheap socket.
after glow pin removal then try to get atomizer screen out. If carboned up bad you will need patience. A small Allen wrench ground to a point works as a makeshift seal pick to get screen out. Normal 90 deg seal pick to big.
remove screen and use new tool to insert new screen to proper depth. Oh be sure vent hole is clean in atomizer screen bore and screen is inserted fully and below vent hole. Put back together.
Best to run heater monthly every month of the year for 10 min at max heat to exercise heater and wait for heater to go thru the full start and stop sequence. If you do that and clean fuel filter or replace yearly. The heater will run for years trouble free.Gentlemanfarmer Thanks this. -
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Not a hard job just can get frustrating. Have fun -
Thanks to all that responded to my Wabasto issues. I did watch several videos of how to disassemble the heater and what issues to look for. WEL had a short video on common issues and disassembles a heater pointing out the various problems such as clogged intake filter, dead glow plug, clogged fan, etc. Wabasto also has several videos that walk through assembly and disassembly.
Fortunately I didn't have to get into the disassembly. Underneath my bunk, next to the Wabasto heater, is a green light. When the light is solid green, the heater is ready to operate. If there is a blinking green light, starting with 5 rapid flashes followed by one or several longer flashes, there is a fault in the system. What you need to do is count the long flashes to determine the fault code. I had 12 long flashes which indicated a heater fault lock out. To solve the lockout, disconnect the power to the heater. The long instructions are to turn the heater on, within 10 seconds disconnect the main fuse, turn the heater off, reconnect the fuse and then turn the heater on. This being a Mack, I disconnect the power next to the indicator light and waited 10 seconds. I then turned the heater on from the bunk control station and the heater came on, but wasn't heating. This time the green indicator light flashed 2 long flashes which meant a fuel supply problem. I check the fuel line and filter, both had fuel. I turned the unit on again and the priming worked and heating started immediately. Problem solved.
Wabasto has an app you can download to your smartphone or tablet called Wabasto Tech Mobile. This will give you fault codes, operating instructions and other valuable information.spsauerland, uncleal13 and jason6541 Thank this. -
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