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Communication Error H74 #487
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Hi Skol6, Remark 3: Setting in HP Service settings Optional PCB to YES gives expectation ,that Optional PCB emulator ( HeishaMon) will sent continuously Optional PCB Set Command. When communication disappear (for around 40s) HP generates H74 error and switches off to StandBy. So ensure continiues communication is very important , be aware during switch off , factory default of HeishaMon , or similar action. Maybe this was my problem too ...Testing the Options |
Hi, Thanks for the remark information. BUT I did not change anything when the failures where coming up. Regards |
Hi, i‘ve not seen any errors in the heishamon menu. Have you installed the CZ-NS5P? |
I am not using the CZ-NS5P. |
Not using the CZ-NS5P but you are getting H74? Then you most be using the optional pcb emulation in heishamon and enable the optional pcb in the heatpump. |
Yes I am using the PCB emulation to control the heat pump. So bug must be something to do with the Heishamon Software. |
Yes but as I said the emulation is not perfect. The H74 pops up if heishamon is a bit too busy and therefore not delivering the messages in time. It helps if you keep heishamon not to active like lowering the timers. |
Hi Folks,
Heishamon was running for several weeks without any issues.
during the last days I got multiple times commincation error H74.
Not nowing what could be the problem I have performed a complete power cycle of my aquarea heat pump.
Afterwards everything is running normal again.
Can someone confirm this issue?
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