502
Thermo E+ 120/200/320 5 Troubleshooting
Error in the water system
Circulating pump does not operate (Aquavent 6000S and
Aquavent 6000SC only).
• Error mode activated.
In case of malfunctions the motor is switched off via the
error mode.
Reactivation of the circulating pump motor
For this purpose disconnect the power supply for > 2 min
(Observe 5.2 !).
After the power supply is reconnected the motor
performs a soft start.
Heater stops as the connected heat exchangers in the
vehicle provide insufficient heat.
Flow rate too small, because
• Air in the heater, heat exchanger or in system
sections.
• Taps/valves (flow controllers) throttled,
contaminated, closed.
• Contaminations in the system, e.g. filters or at bottlenecks
• Circulating pump delivery rate insufficient
(air in pump housing)
• Insufficient frost protection (antifreeze or incorrect
mixing ratio)
• System resistance too high (especially high in the cold).
• Circulating pump defective
Heat exchanger provides not enough heat, because
• Air in the heat exchangers and/or system sections.
• Contaminated heat exchangers, soot
• Insufficient air entry or air exit.
• Fan: Insufficient delivery rate /
incorrect direction of rotation / resistance too high.
• Antifreeze content too high.
Approximate flow rate determination:
Heat flow [kW] according to type plate
Flow rate in [l/h] = x 860
Temperature difference Δt in [K] or [°C]
measured on the heater between water inlet and water outlet
(e.g. using contact thermometer)
Table 501 General error symptoms
Error symptom Possible cause
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