Got an fh4 having night heater issues if o turn it on motor kicks in for 3 seconds then turns off.
If i set it to lowest temp will kick in for about 30 seconds then turn off. Cant get it to stay on at a temp of 21 or 22
edinburgh_newbie:
Got an fh4 having night heater issues if o turn it on motor kicks in for 3 seconds then turns off.If i set it to lowest temp will kick in for about 30 seconds then turn off. Cant get it to stay on at a temp of 21 or 22
Does the night heater light stay on.?
Geoffo:
edinburgh_newbie:
Got an fh4 having night heater issues if o turn it on motor kicks in for 3 seconds then turns off.If i set it to lowest temp will kick in for about 30 seconds then turn off. Cant get it to stay on at a temp of 21 or 22
Does the night heater light stay on.?
No mate goes off
Not much help to you but mine did exactly that when I got it it turned it wasn’t fully fitted I the lockers parts missing? Has it ever worked. Is it new new or just new to you? It may never of been fully Installed.
Trying going into the dash menu and try and perform a cleaning cycle see if that helps.
Had this in a brand new 67 plate, came out the factory with a duff night heater… get it booked in’ already getting colder mornings
Colin_scottish:
Trying going into the dash menu and try and perform a cleaning cycle see if that helps.
Wont do the cycle cuts off after 3 secs
red7jase:
Not much help to you but mine did exactly that when I got it it turned it wasn’t fully fitted I the lockers parts missing? Has it ever worked. Is it new new or just new to you? It may never of been fully Installed.
New to me but a 2014 lorry sure it will have worked in the past
Did you check the near side locker to see if there is any damage to any of the parts in there.If theres no damage it could be the heater its self maybe seized inside if not been used for a while.
Colin_scottish:
Did you check the near side locker to see if there is any damage to any of the parts in there.If theres no damage it could be the heater its self maybe seized inside if not been used for a while.
What in particular wouls i be looking for in near side locker?
First check both vents aren’t covered, turn thermostat on dash high, then go into maintenance on dash and try to get it to do a cleaning cycle, also check the pump is ticking, think it’s under catwalk on tank. Also check climate settings in the menus
did you check the inlet inside the cab
edinburgh_newbie:
Colin_scottish:
Did you check the near side locker to see if there is any damage to any of the parts in there.If theres no damage it could be the heater its self maybe seized inside if not been used for a while.What in particular wouls i be looking for in near side locker?
When you open the locker on the left hand side you see the inlets to the cab see if there damaged you will also see the heater if not lift the bed and look in from the top.Check the vents behind the seats make sure there clear and not blocked.There 2 either side of the passenger seat.
edinburgh_newbie:
Got an fh4 having night heater issues if o turn it on motor kicks in for 3 seconds then turns off.If i set it to lowest temp will kick in for about 30 seconds then turn off. Cant get it to stay on at a temp of 21 or 22
Most likely, you have tried, but if you set the temperature dial to the 10 o’clock position, or higher up on heat, in case the thermostat temperature inside the cab is higher than the pre-set controller…sometimes the obvious fixes solve things, then again! 
edinburgh_newbie:
Got an fh4 having night heater issues if o turn it on motor kicks in for 3 seconds then turns off.If i set it to lowest temp will kick in for about 30 seconds then turn off. Cant get it to stay on at a temp of 21 or 22
2 very cold nights abroad one weekend recently and after google and all else failed spoke to the mechanic on Monday who started me on the right track so I’ll post this now for future reference as it’s a bit late to help you.
If a fault has occurred it may require the laptop to reset it but this workaround may get a heater back running in the meantime hopefully.
On my truck the icool and night heater are operated by a switch and the normal temperature dial on the dashboard for the digital display.
The key is to pull the fuse to the heater while it is being powered i.e. during those brief 3 seconds while it is trying to start.
On mine the night heater fuse is F69 so I started the heater and immediately pulled this one.
Popped fuse back in and restarted the heater only to hear that gorgeous comforting purr that only a night heater can give you on a freezing night.
2 mistakes I was making before this was pulling the fuse long after the heater failed to start. Since it had already shut down it was unpowered anyway so pulling fuse made no difference.
Second was noticing that pulling fuse F69 did not immediately cut off power to the temperature display panel I assumed I had the wrong fuse. However afterwards I realized the temperature display is powered by the climate control (A/C) fuse F38.
If you haven’t done it before the the fuse cover (top panel of dashboard) is “hinged” at the windscreen side so initially lift it at the footwell side to open.
You don’t need a manual as the panel has a decal with all the fuses marked on it.
1 Like