Truma c3400 not starting

Doggo316

Newbie

Gender: n/a
Age: 52
Posts: 1
Registered: 08 / 2016

Subject:

Truma c3400 not starting

· Posted: 26.08.2016 · #1

This is my first post so please be gentle on me. My Truma c3400 water heater wont fire up. When I flick the control switch either wat the LED's just flicker. If I flick it to the room & water direction the fan starts up after about 15 seconds. Reading the manual it says that LED flashing on and off straight away indicates low voltage. Checked supply voltage and it's at the requisite 12v. Checked the fuses on the PCB and all 3 are fine. Any ideas?

StrandCampingDoonbeg

Eat's Sleep's craic

Gender: n/a
Location: Kilrush Co Clare
Age: 59
Posts: 2024
Registered: 05 / 2014
My Motorhome: mobilvetta mh 85
Base Vehicle: Fiat

Subject:

Re: Truma c3400 not starting

· Posted: 26.08.2016 · #2

I'm no expert but I struggled to get my water heater to work until I realised I had to take the external cover off, located outside the van. It might just be that simple, hopefully.

the fat controller

Eat's Sleep's craic

Gender:
Location: Moira, Craigavon
Age: 61
Homepage: fincaangelacat.com
Posts: 9485
Registered: 04 / 2012
My Motorhome: Benimar Tessoro 481
Base Vehicle: Ford Transit

Subject:

Re: Truma c3400 not starting

· Posted: 27.08.2016 · #3

If the exhaust vent is under a window there may be a switch on the window that cuts out the heater to stop fumes getting back inside the van.

Also if you battery is reading 12v exactly it is low on power, a battery should read high 12's or even 13v, can't remember the exact figure at which a battery is flat

hillton9

Eat's Sleep's craic

Gender:
Location: Crossgar
Age: 68
Posts: 2910
Registered: 07 / 2013
My Motorhome: Rollerteam t-line 740
Base Vehicle: Fiat muiltijet

Subject:

Re: Truma c3400 not starting

· Posted: 27.08.2016 · #4

I agree with fat controller your batt should be reading 13 -13.5 volts if you have a meter switch a few other things on and see what the voltage drop is your batt may be on its way out

Mark&Wendy

Eat's Sleep's craic

Gender:
Location: Killinchy, Co. Down
Age: 59
Posts: 1334
Registered: 02 / 2016
My Motorhome: Roller team 707
Base Vehicle: 2016 Ducato

Subject:

Re: Truma c3400 not starting

· Posted: 29.08.2016 · #5

You could try starting it with the engine running to rule out the low voltage issue. Have you also checked the 'cold weather' safety valve is closed and that the water is flowing through the hot water tap.

baguette

Eat's Sleep's craic

Gender:
Location: Cork
Age: 74
Posts: 2939
Registered: 11 / 2011
My Motorhome: Rapido 963F
Base Vehicle: Ducato 2.8 JTD Power

Subject:

Re: Truma c3400 not starting

· Posted: 30.08.2016 · #6

Quote by Doggo316

The year before last I had a similar problem while away in Spain. The system would not start sometimes but after a time it would not start at all.
The red LED was indicating a 'low voltage' fault, the voltage needs to be at least 10.5v IIRC.

I knew the voltage was as it should be so I took the vehicle to the Truma agent in Valencia who diagnosed that the voltage sensing function on the PCB had gone faulty, it was reporting a low voltage and preventing the unit from starting up.
A new PCB which cost €400 including diagnosing the problem and fitting

Registered users in this topic