FAQ | 5
B1820023_en | Service handbook Lambdatronic H 3200 - T4e 97
5.2 Pump stall protection
After extended standstill times, there is a risk the pump drive may block due to corrosion
and deposits. The pump stall protection feature is intended to prevent this.
The control ensures that the circulation pumps are switched on briefly on a regular basis,
even outside the season of use.
At that time, the pumps are activated for 15 seconds at 100%.
The following components are affected:
▪ DHW loading pump
▪ Buffer pump
▪ Collector pump (not applicable to system 12 and system 13)
▪ Difference control pump
▪ Heating circuits (15 seconds pump run, subsequently the mixer starts up and shuts
down again)
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