ᐅ Heat pump cycles up to 60 times per day

Hello, our Elco aerotop Split 07 air-to-water heat pump cycles on and off every 30 minutes. A hydraulic balancing has been carried out. I have also disconnected all ERRs and removed the actuators. I have performed a thermal balancing to the best of my knowledge. However, the longest heating circuits were not fully opened during this process. I suspect that the heat pump is oversized, which might cause overheating, as the heating curve is already set to the minimum. I have attached a picture that logs all data from the last week. From this, I also observed that the heat pump currently cycles every 30 minutes. Additionally, the flow rate remains constant whether the pump is running or not. It must have been cycling since installation, as the unit already shows over 10,000 cycles after two years. I suspect this is all related to the settings. Therefore, I list some settings and general information below.

146 m² (1,576 ft²), 2 people, single-family house, no basement, underfloor heating, ventilation system with heat recovery, photovoltaic system, insulation close to KfW 40 standard (without official subsidy).

Heat pump operation: eco plus
Flow temperature adjustment +2 degrees
Pump operation modulating
Max pump PWM 100
Min pump PWM 70
Hot water 48 degrees (118°F)
Hot water target minimum 43 degrees (109°F), heated only at midday
No nighttime setback
Silent mode enabled (performance reduced to 70% due to noise concerns)
Bypass valve open, see picture
Heating curve 0.2 (range 0.2 to 1.0 possible)

Buffer tank:
Buffer charging activation: off (should this be off?)
Buffer tank hysteresis 5 degrees (9°F)
Buffer target temperature 40 degrees (104°F)
Buffer charging type set to partial charging
Buffer heating hours: 0 (for nearly 2 years)
Buffer charges: 0
Buffer temperature 23 degrees (73°F)

During operation, the system shows the following values. As I have been told, it is strange that the hot gas temperature is so low.

Evaporator temperature 0 degrees (32°F)
Suction gas temperature 2 degrees (36°F)
Hot gas temperature 28 degrees (82°F)
Condenser 24 degrees (75°F)
Compressor 23 Hz
Speed 625

Below are my heating circuits with their lengths and current flow rates. Parentheses show the settings from last winter. Why have the flow rates changed so much (especially upstairs)? Could this be caused by the heat pump settings?

Ground floor:
WC 49 meters (161 ft) Flow 1.0 (1.0)
Office 59 meters (194 ft) Flow 1.3 (1.5)
Hallway 45 meters (148 ft) Flow 0.5 (0.6)
Utility room 40 meters (131 ft) Flow 0.4 (0.4)
Kitchen 84 meters (276 ft) Flow 1.0 (1.1)
Living room right 89 meters (292 ft) Flow 1.9 (1.6)
Living room left 106 meters (348 ft) Flow 1.7 (1.6)

Upstairs:
Bathroom 100 meters (328 ft) Flow 2.6 (1.9)
Child 1 103 meters (338 ft) Flow 1.1 (1.4)
Hallway 16 meters (52 ft) Flow 0.3 (0.6)
Bedroom 67 meters (220 ft) Flow 0 (0.5)
Dressing room 34 meters (112 ft) Flow 0 (0.6)
Child 2 88 meters (289 ft) Flow 1.5 (1.4)

What adjustments can be made here, or is a technician’s inspection essential?

Definitely oversized to a very safe extent, especially when combined with a buffer (others will need to comment on the settings) and possibly too low hysteresis.