Temperature issue Gambro AK 200

[Maxence11]

Hello all,
Serious problem on AK200. During desinfections, temperature on bargraph remains at 28-30 deg. Celsius.All fuses are good. I checked all connections of heater. But i remarked that there's 0 volt at the outlet of the relay supplying the heater even when we have 220v at the inlet. So i replaced the relay unit. But same situation.
Any help and suggestions ?

[Ian Wilde]

Hi Maxence,

Can you confirm which fuses you checked?  Also, what about the thermal trips?

[Maxence11]

I've checked the two 10A fuses on the power supply unit just at rear of the machine. Also the two fuses on the relay unit.
The temperature stayed at 28-30°C. The heater elements seemed to be good (about 60 Ohms).

[Ian Wilde]

Not worked on them for a while so you'll have to bear with me - have you checked the two thermal trips on top of the heating vessel at the back?

[Maxence11]

I did not check the thermal trips. But i've replaced all the heating vessel with a new one.

[fraser gilmour]

put the machine through FCH and it should give you an error code when the heater and thermistors are tested.

[Maxence11]

There's no error code in FCH. But at the end of disinfection, the machine asked me to check fuses and connectors. The time also changed into -01

[fraser gilmour]

Is the machine able to reach 37 degrees dialysate temperature after FCH, can you see a voltage on the heater relay output at this point?

[Maxence11]

The machine can not reach 37°C after FCH. It's always around 30°C. The voltage is almost 0Volt. That's why i have replaced the relay unit.But the problem is the same.

[fraser gilmour]

I'm assuming the ambient water temperature in your clinic in Togo is 30 degrees?
If all the thermistors are reading correctly there should be a control signal sent to the heater relay to switch the heaters on, if I remember correctly this is directly from the FM board to the heater relay board and is a four pin cable. Check this is connected. Also check the fuses in the PSU and on the relay board, I think both live and neutral are fused.
It's been a while since I worked on these, can you post or email me a picture of the relay board?  

[John Nixon]

in the past there has been a few thing that can cause this:-

hanson connectors not firmly connected
Tube off FOP, ZEVA, CH 1 input UFcell
over temperature sensors have tripped
heating vessel is showing medium when it is empty (use GXL to check) this can be a faulty level detector in the heating vessell

[Maxence11]

hello,
I have tried everything. Maybe a problem on the FM CPU board. I would like to replace this board, but I don't have a typical one. I took one of another machine but i get the error Srb on the panel. Surely a problem of compatibility.