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Heater not starting D4
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Member Since: 20 Jan 2018
Location: Warwickshire
Posts: 134

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Siberian SilverDiscovery 4
Heater not starting D4

Had my D4 just a few weeks.
Had to have the battery changed yesterday - except for a few lights it was completely dead.
Was expecting that because Iā€™d had the Failed to start message on the display having tried to use the heater a couple of times.
However, with brand new battery fitted yesterday and plenty of fuel I got the same low fuel/battery message this morning.
Any pointers on where to start looking would be appreciated.
 Current : Discovery 4 HSE (2012 spec)
Current : BMW Z4 20i MSport
Current : BWM Z4 3.0SI Sport Auto
Previous : Freelander 2 HSE 
 
Post #19121478th Feb 2018 9:49 am
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NJSS
 


Member Since: 06 May 2009
Location: Catherington, Hampshire.
Posts: 6104

United Kingdom 2016 Discovery 4 TDV6 Landmark LE Auto Waitomo GreyDiscovery 4

This might be a good place to start:-

https://www.disco3.co.uk/wiki/Fuel_Burning_Heater

NJSS
 2016 Discovery 4 Landmark
1973 MG B GT V8 - 3.9L John Eales engine, 5 speed R380 gearbox, since 1975.
1959 MGA roadster - 1.9L Peter Burgess Engine - 5 speed gearbox
Past LRs - Multiple FFRs, Discos & a Series I - some petrol, some diesel 
 
Post #19121518th Feb 2018 9:57 am
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Member Since: 20 Jan 2018
Location: Warwickshire
Posts: 134

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Siberian SilverDiscovery 4

Anyone know what voltage the FBH cuts out?

After several weeks frustration with the FBH running only for a few minutes before shutting down if running at all, am going to have the battery swapped.

Charged the battery for 5 hours on Thursday evening and was showing fully charged on the charger. Car not used yesterday, but this morning put the heater on to warm the car up while I cleared the snow.
It ran again for about 6 minutes and shut down.
Started it ook the car out, not for long admittedly and it needed about 1 sec with the glow plugs working to start.
The touch screen display didn't come on although the radio was working.
Got back and the battery was measuring just 12.4V.

I would have thought I'd every right to expect the FBH to run on a new Bosch S5 battery even if it has been out in the cold for two nights - That's just why its there surely.

When you start the car the FBH runs just as you're expect. The alternator is running at 15.1V no load and at 12.9V fully loaded with screens and heated seats on.
Just been on charge (thats the 5th time in 3 weeks) on the frost setting (5A at 14.7V) for two hours and was still only 12.75V. Disconnected the battery and reconnected it and that reset the display which was back and working.

Can't imagine there is enough residual current to crash the battery in 36 hours and the car cranks just fine - just won't keep the voltage higher enough to get the FBH running through a full cycle.
The car usually gets 2 x 30 mile journeys each day (40-50 minutes each way) - even in this weather that should be enough to keep the battery topped off, especially if it getting 15V for much of that.

I can only think that the new battery must be duff.

Any opinions, helpful advice?
 Current : Discovery 4 HSE (2012 spec)
Current : BMW Z4 20i MSport
Current : BWM Z4 3.0SI Sport Auto
Previous : Freelander 2 HSE 
 
Post #19217723rd Mar 2018 5:48 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Somewhere.
Posts: 60690

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Zermatt SilverDiscovery 4

Yer alternator is goosed. If it's running at 12.9v with everything on then basically the battery is doing the work. Thumbs Up

PS and prob the battery if it's not holding the voltage, pos the alternator has taken the battery with it.
 

11 D4 HSE - just Dee, no more Double Disco. Sad

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Post #19217753rd Mar 2018 5:52 pm
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Member Since: 20 Jan 2018
Location: Warwickshire
Posts: 134

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Siberian SilverDiscovery 4

If that had happened over a couple of days or more, I could understand it.
But, the FBH didn't run after a full charge without having started the engine. Had been stood 36 hours, but that shouldn't be such a problem surely.

Is there a possibility that the alternator sinks current back though it when the engine is off?
Faulty rectifier?
 Current : Discovery 4 HSE (2012 spec)
Current : BMW Z4 20i MSport
Current : BWM Z4 3.0SI Sport Auto
Previous : Freelander 2 HSE 
 
Post #19217783rd Mar 2018 5:56 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Somewhere.
Posts: 60690

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Zermatt SilverDiscovery 4

Fully loaded, a working alternator would hold 14.something volts easily, not drop to 12.9v. Plus 15.1v lightly loaded, which it can cope with, is too high so to me (from experience in my D3) and is showing battery is struggling. Thumbs Up

I could be wrong, I was once. I was a Tuesday and was raining!! Laughing
 

11 D4 HSE - just Dee, no more Double Disco. Sad

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Post #19217823rd Mar 2018 5:59 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 4919

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

What battery have you fitted?- new batteries are not necessarily fully charged.
So you had the FBH on without the engine running while you cleaned the snow off, big mistake, on a nice summers evening with car doors being opened and closed, radio playing while you wash/clean the car will result in a flat battery in less than 30 minutes Shocked, lessen number one Disco's are battery hungry.
What battery charger are you using and how are you using it? 5 hours is not enough to charge a Disco battery unless you have a 20+amp battery charger of the correct type, i.e. Ctek.

Edit 5 amp charger for 2 hours won't fully charge it, leave it on all night, I charge mine up 2/3 nights a week through the tow socket while the weather is like it is, stop start driving everything electric on, heated seats, Windows back and front, lights, FBH twice possibly 3 times a day.
Have you a fridge in the central cubby box switched on.- they are battery killers.
 It can when others can't,
It will when others won't,
It goes where others don't. 


Last edited by M3DPO on 3rd Mar 2018 6:36 pm. Edited 3 times in total 
Post #19217833rd Mar 2018 6:02 pm
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Henda
 


Member Since: 05 May 2016
Location: Gateshead
Posts: 468

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Manual Siberian SilverDiscovery 3

I changed my battery and like dsl said should be running at 15ish when running
My problem is I've lost key fob locking
Good luck
 All transmission oil replaced
3 flash indicators
All timing belts changed
EPB serviced
De cat fitted
Wind deflectors
De-tango done
Tints fitted
Egr blanked 
 
Post #19217883rd Mar 2018 6:03 pm
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Member Since: 20 Jan 2018
Location: Warwickshire
Posts: 134

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Siberian SilverDiscovery 4

It's a CTEK MX5 - Not the best charger for this but it's one I got to keep my BMW Z4 3.0 charged up.

Have put it on overnight to see what it registers tomorrow. Speed of charge isn't an issue then and I hope the processor decides correctly when it is charged.

12.4V is about 75% charged. It was down again to 12.55V just now.

I would have thought if you've got a car pulling lots of amps that the alternator wouldn't be able to maintain its no load voltage, so 12.9V didn't seem too bad. I'd expect any power source to drop under full load. It isn't a constant voltage source, but, if you reckon it should maintain a much higher voltage then maybe there is a problem elsewhere.

The battery is a Bosch S5 95Ah 800CCA. The original was an OEM 95Ah 950CCA battery.
Appreciate they are not fully charged when you get them. I charged it overnight a day or two after getting it.

The car is cranking OK so am not immediately concerned about that aspect.

Might have to get a MX25 I guess.

Anyway I'll be getting a new battery Tuesday - it will be fully charged before it goes in.
 Current : Discovery 4 HSE (2012 spec)
Current : BMW Z4 20i MSport
Current : BWM Z4 3.0SI Sport Auto
Previous : Freelander 2 HSE 
 
Post #19218063rd Mar 2018 6:43 pm
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Member Since: 20 Jan 2018
Location: Warwickshire
Posts: 134

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Siberian SilverDiscovery 4

BTW - The fridge isn't on. Usually switch the heated screens off as soon as they are clear and only the drivers seat on for a couple of minutes max. Have been trying to manage the current drain to see if that has had any effect - it seems not.
 Current : Discovery 4 HSE (2012 spec)
Current : BMW Z4 20i MSport
Current : BWM Z4 3.0SI Sport Auto
Previous : Freelander 2 HSE 
 
Post #19218083rd Mar 2018 6:46 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Somewhere.
Posts: 60690

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Zermatt SilverDiscovery 4

The alternator should be able to hold a decent voltage (14.something) with everything on, then it's running the car's needs and replacing the charge in the battery from starting. If it's dropping down to 12.9V that means it can't keep up with demand and is not a happy bunny.
 

11 D4 HSE - just Dee, no more Double Disco. Sad

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Post #19218113rd Mar 2018 6:50 pm
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Sloss
 


Member Since: 18 Aug 2013
Location: Aberdeenish
Posts: 1664

Scotland 

I agree with Des, my alternator shows 14.5-7 with lots on, so yours is not coping Confused

However my FBH only works intermittently over the 4 years I've had my D4. I tell myself it doesn't matter but secretly I'd like it to work Rolling with laughter
 Stew,

2010 D4 gone but I really loved it
Went back to Merc - C350 AMG 


Last edited by Sloss on 3rd Mar 2018 6:57 pm. Edited 1 time in total 
Post #19218183rd Mar 2018 6:56 pm
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Redline
 


Member Since: 20 Jan 2018
Location: Warwickshire
Posts: 134

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Siberian SilverDiscovery 4

If need be I'll get some diagnostic kit with logging on it from the techies at work to monitor the voltage at and current flowing into/out the battery.
 Current : Discovery 4 HSE (2012 spec)
Current : BMW Z4 20i MSport
Current : BWM Z4 3.0SI Sport Auto
Previous : Freelander 2 HSE 
 
Post #19218203rd Mar 2018 6:57 pm
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Member Since: 20 Jan 2018
Location: Warwickshire
Posts: 134

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Siberian SilverDiscovery 4

OK - Am getting the message. Embarassed
I'll ask them to get an alternator in for Tuesday and have it changed.
 Current : Discovery 4 HSE (2012 spec)
Current : BMW Z4 20i MSport
Current : BWM Z4 3.0SI Sport Auto
Previous : Freelander 2 HSE 
 
Post #19218213rd Mar 2018 6:59 pm
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Somewhere.
Posts: 60690

United Kingdom 2011 Discovery 4 3.0 SDV6 HSE Auto Zermatt SilverDiscovery 4

I've just read that to SWMBO and she says I'm a bully. Sorry. Embarassed Embarassed

I'm just going by what happened to my D3 before the battery died, then the alternator died and took the new battery with it. Hey, ho it's only money. Big Cry Big Cry
 

11 D4 HSE - just Dee, no more Double Disco. Sad

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Post #19218263rd Mar 2018 7:04 pm
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