Impulse 2.0 problems

Jacq

Just Joined
Jan 12, 2019
2
0
#1
I bought a Kalkhoff endeavour about 6 months ago, and have experienced 4 times in that period that my ebike would not start up in the morning after having used it just fine the day before . Battery shows as charged & until now at some stage it starts working ok again. No rhyme nor reason when that will happen. My dealer has no idea what it is and cannot replicate the fault (sod's law that it has come on again by the time they have it in the workshop). I think it needs to be replaced under warranty. Has anyone ever experienced this problem?
 

soundwave

Esteemed Pedelecer
May 23, 2015
8,622
285
#2
yup near every impulse motor fails there was a massive thread on here about it and the only fix offers was endless motor replacements until it was pointed out they only got so many times to fix it or money back under uk trading standards.

i would get a full refund as there not fit for purpose.
 

Jacq

Just Joined
Jan 12, 2019
2
0
#3
Yes, I have read those but they seem to concern the old Impulse motors (mine is only from 2018) and what is described does not seem to match my experience. Mine almost feels like an electrical communication problem between on/off switch, monitor and/or battery, as the display malfunctions (does not light up). It never happens during use but always next morning after having used it fine the day before (and been on charge in between). My bike shop says they have never come across it and they did know about the motor problems in the past.
 

soundwave

Esteemed Pedelecer
May 23, 2015
8,622
285
#4
if you can get a refund then it is ur best option as id not bet on any impulse motor it is just not worth the hassle.
 
Oct 25, 2006
41,361
2,149
#5
I'd suspect the connectors between the head unit cable and motor losing connection, a quite common problem. Condensation or forming a diodic layer are usual causes.

Try unplugging and replugging two or three times, preferably spraying them with some switch/contact cleaner while apart. There's a very good chance that will solve the problem.
.
 

Alzibiff

Just Joined
Oct 7, 2018
1
0
63
#6
I have had a similar problem on one of the two Kalkhoff Agattu Excite bikes which we bought last August. On four occasions, the bike has effectively reset itself - mileage goes to zero, clock goes to 00:00, and when I push it out of the garage, no speed shown on the display. This has happened after I have had the battery out for a day or so and wondered whether it had anything to do with the system backup battery losing its connection. (There must be a battery somewhere which keeps the clock ticking when the main power pack has been taken out). After a while, I can get power assist but not until I have gone through the gears a couple of times - I cannot see any rational explanation for this!

My dealer is also perplexed but has agreed to swap the “head unit” under warranty in the hope that this fixes it. I cannot find any technical detail online but what IS the function of the head unit? Is it more than just a display?

I should add that there is no problem when out riding so I have ruled out any intermittent connection issue when the power pack is fitted.
 

vfr400

Esteemed Pedelecer
Jun 12, 2011
474
129
Basildon
#7
Nearly all the head units on electric bikes are sophisticated devices. They have a microcontroller in them that performs several important functions ant it communicates with the microcontrollerm in the motor's control board. On most bikes, they work more or less independently and their power wires are shared with the motor's control board so that when you switch on the control panel, it switches on the motor too. That's why your bike can't work when the LCD is off. If the LCD won't switch on or it switches itself off, it's because its supply from the battery has been interrupted.
 

LNEL

Just Joined
Mar 17, 2019
1
0
#8
Yes, I have read those but they seem to concern the old Impulse motors (mine is only from 2018) and what is described does not seem to match my experience. Mine almost feels like an electrical communication problem between on/off switch, monitor and/or battery, as the display malfunctions (does not light up). It never happens during use but always next morning after having used it fine the day before (and been on charge in between). My bike shop says they have never come across it and they did know about the motor problems in the past.
I have the same problem. The on/off switch is dead every morning even though the battery has good charge. The only fix is to connect the battery to a mains outlet and then the switch starts operating. I can disconnect the mains and the on/off switch will operate the bike as normal. However, once I turn off and leave the bike off for more than a few minutes, cant turn on again without re-connecting battery to the mains.
 

Eagle

Esteemed Pedelecer
Aug 31, 2012
297
50
#9
Jacq,
My advice would be to reject the bike and get a refund, or do a swap with a non-Kalkhoff ebike.
 

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