My bunk heater will not stay running. I just bought a new unit and installed it today. The heater will fire run for about a minute then turn off. I have a 2017 prostar isx15. I did read something about coolant valves but I don't see any under the bunk cab or hood. Oh and yes this is a espar d5ws hydronic heater attached to the epu system.
(12-08-2022 )Trey7981 Wrote: [ -> ]My bunk heater will not stay running. I just bought a new unit and installed it today. The heater will fire run for about a minute then turn off. I have a 2017 prostar isx15. I did read something about coolant valves but I don't see any under the bunk cab or hood. Oh and yes this is a espar d5ws hydronic heater attached to the epu system.
here is some related info that might help...
ref:
http://rawze.com/forums/showthread.php?t...0#pid31140
One of the reason it could stop working because coolant temperature is achieved high level. Check coolant hoses from heater and in heater are they hot? If return hose isn't hot/warm you have coolant circulation problem. Installed wrong or coolant circulation pump not working.
Would anyone be able to take a pic of the coolant lines under the truck. Neither line feels hot and I can feel flow(or attempted flow) in the lines. Maybe my lines are backward. I reconnected them as they came of the old unit.
(12-09-2022 )Trey7981 Wrote: [ -> ]Would anyone be able to take a pic of the coolant lines under the truck. Neither line feels hot and I can feel flow(or attempted flow) in the lines. Maybe my lines are backward. I reconnected them as they came of the old unit.
Take a picture how your heater mounted. Is it connected to the truck cooling system? If heater is above APU coolant level probably lines need to be purged to let air out then circulation pump can create flow.
(12-08-2022 )Trey7981 Wrote: [ -> ]My bunk heater will not stay running. I just bought a new unit and installed it today. The heater will fire run for about a minute then turn off. I have a 2017 prostar isx15. I did read something about coolant valves but I don't see any under the bunk cab or hood. Oh and yes this is a espar d5ws hydronic heater attached to the epu system.
If a diesel unit, it could be air in the fuel line. It may take a dozen or more attempts to fire the unit to purge any and all air out.
Dont know what kinda controller is on that one being connected with the apu but they do give codes tellin ya wtf they crying about.
I feel your pain. I have a espar heater in my truck that doesn’t work (D2) Fan turns on for maybe 5 minutes and shuts off. Pump doesn’t attempt to run or click at all. Then get the red light with 52 code. It’s never worked since I owned the truck and the previous owner never used it. They only idled. Hope you can have a little better luck than I usually get. Good luck!
(12-12-2022 )BrandonOlsen Wrote: [ -> ]I feel your pain. I have a espar heater in my truck that doesn’t work (D2) Fan turns on for maybe 5 minutes and shuts off. Pump doesn’t attempt to run or click at all. Then get the red light with 52 code. It’s never worked since I owned the truck and the previous owner never used it. They only idled. Hope you can have a little better luck than I usually get. Good luck!
eBay and or Amazon has all the parts to get your D2 running. There are two fuel filter screens, the one in the little fuel pump is likely clogged up. Then there is another screen in the D2 unit itself that more than likely needs replacing. Here is the repair kit I used, $35, it has the two filters you need.
https://amzn.to/3PjPAJK
I would also purchase a new glow plug, you will be in there, replace it. I prefer the Espar OEM parts,
https://amzn.to/3hhPOEI
Here is the exhaust and I bought another for the intake side, so two of these flex pipes
https://amzn.to/3FmHOKO
This fuel line kit, mainly for the hose clamps, I broke a couple of them when removing the in line fuel pump.
https://amzn.to/3FNfm5W
Here is a very good video on everything you will need to know on rebuilding and cleaning of your D2 heater.
https://m.youtube.com/watch?v=56HCZ0C0ORk
I rebuilt mine in October, running like a champ!