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Swiss Caravaner searching for Help - Primus Aquaflex AQWE6
Mjerica:
I need to rectify my last comment. In the entry you clearly stated that the controller
starts the heating sequence, it means heating actually is called for. I should have read
the entry again after being absent awhile. Some rethinking is needed now.
So you told that heating sequence proceeds somewhat, looks like to the point where
ignition in expected. Those LEDs in the valve PCB indicates that holding coils are energized
but they does not necessarily open without activation coils energized. Now the question arises
if you did hear the clunking sound they make on opening? The red alarm LED in the control
panel should light up on missed ignition anyway...
On the last picture in #5 the valve unit connector looks like slided partly away of its position?
Do I see it correctly?
swiss_guy:
@Mjerica
i checked the 48k Ohm resistor, its 29k Ohm, i hope i catched the correct one? Since this is parallel with 2 others, you mentioned it should be 21.3 k Ohm?
i realized the red diode on the control panel was no more soldered correctly to the controller board, i fixed that.
now i try to measure the voltage on the mainboard on the mentioned ports, MCU pins 6,7,8
and 18, what are the expected values?
at least now the red error LED works again on the control panel, but i have still the same problem, please see the video under this link:
https://share.icloud.com/photos/077ElUcjtaMszZ_tRd7OL2YVg
Mjerica:
Patrick, in this picture you are measuring between wrong points.
(75k&47k connected to U2 pin 7)
In the picture, the temperature sensor RT1 is just behind your plusprobe tip.
"i realized the red diode on the control panel was no more soldered correctly to the controller board"
- Now this begins to make sense, we were dealing with two independent faults. That is often confusing.
One fault left.... for now on, everything should become more straightforward.
- Let's leave MCU pins 6,7,8,18 for a moment, we'll come back to these later if necessary.
@Patrick:
"I hear the blower turns on, after 15sec the gas switch opens (on the gas switch for a short
time the 3rd led is active, then only the 2 top leds are active > see attached picture),
the ignitor is active for 2-3 secs, then the blower starts to turn faster and nothing happens"
In the video, what I saw, (or I believe I saw), it looks like no valve LED on until in the final
moment of ignition. And then, only very short flash simultaneously with (main?)valve opening
sound followed by shutdown to the alarm state.
Do you see/hear something different?
My (kind of) impression is that valve activation makes supply voltage to drop abruptly and causes
shutdown and terminates the starting sequence. Some other explanations are possible though.
I will check the video some more time tomorrow.
It would be interesting know how voltages behave in (main controller PCB) PIC16C62A pins 26, 27
and connector JP2 pins 4, 3 respectively in starting sequense. But these needs very carefull handling
of probes not to make damaging short circuits.
swiss_guy:
@Mjerica
thank you for your answer, i just measured the correct resistor, and its 27.4 k Ohm.
i will try to measure the PCB-Board Pins 26, 27, and JP2 pin 4,3 tonight.
The video i posted, is the exact problem situation, its every time the same behavior.
mjo33400:
--- Lainaus käyttäjältä: swiss_guy - 31.03.2026 kello on 10:15 ---@mjo33400, thank you for this advice, i will check this when i get back home. Just to be sure, you are speaking about the 3 LED on the Gas Switch module? Kind regards, Patrick
--- Lainaus päättyy ---
Kyllä puhun.
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