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Viessmann VITOTRONIC 200 Service Instructions Manual
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Viessmann VITOTRONIC 200 Service Instructions Manual

Heat pump control unit messages
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VIESMANN
Service instructions
for contractors
Vitotronic 200
Type WO1C
Heat pump control unit messages
VITOTRONIC 200
Please keep safe.
6173192 GB
9/2023

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Summary of Contents for Viessmann VITOTRONIC 200

  • Page 1 VIESMANN Service instructions for contractors Vitotronic 200 Type WO1C Heat pump control unit messages VITOTRONIC 200 Please keep safe. 6173192 GB 9/2023...

  • Page 2: Safety Instructions

    Safety instructions Safety instructions Please follow these safety instruc- tions closely to prevent accidents and material losses. Safety instructions explained Danger Note This symbol warns against the risk Details identified by the word "Note" of injury. contain additional information. Please note This symbol warns against the risk of material losses and environmen- tal pollution.
  • Page 3 Safety instructions Safety instructions (cont.) Safety instructions for working on the system Working on the system Please note Electronic assemblies can be dam- Isolate the system from the power sup- ■ aged by electrostatic discharge. ply, e.g. by removing the separate fuse Prior to commencing work, touch or by means of a mains isolator, and earthed objects such as heating or...

  • Page 4: Repair Work

    – ate our warranty. Soldering or welding work is being – For installation and replacements, carried out. use only Viessmann original parts Display signs prohibiting smoking. ■ or parts approved by Viessmann. Danger Damage to the refrigerant circuit can cause refrigerant to enter the hydraulic system.
  • Page 5 Index Index Messages ........................ Keyword index ........................ 28...
  • Page 6 Messages Messages Messages System characteristics Cause Measures Vitotronic 200, type WO1C Normal operation Delivered condition set af- Reconfigure system. ter recognition of data er- ror.
  • Page 7 Messages Messages (cont.) Messages System characteristics Cause Measures Limited or no heat pump Reading the additional The additional 2-digit code con- and/or heating system func- code: tains further information (additional tionality Additional messages for messages). Each digit is a hexa- configuration faults: decimal value.
  • Page 8 Messages Messages (cont.) Messages System characteristics Cause Measures The instantaneous heating The query "Secondary Fill and vent the secondary circuit. water heater is not started, circuit filled?" during en- Then enable the instantaneous not even for frost protection. abling of the instantane- heating water heater: Set "Enable ous heating water heater instantaneous heating water...
  • Page 9 Messages Messages (cont.) Messages System characteristics Cause Measures Operation with temperature Short circuit, secondary Check resistance value (Pt500A) ■ value of return temperature circuit flow temperature at plug F8 or at terminals X25.9/ sensor in secondary circuit, sensor X25.10: See "Controller and sen- plus 5 K.
  • Page 10 Messages Messages (cont.) Messages System characteristics Cause Measures Operation with temperature Lead break, secondary Check resistance value (Pt500A) ■ value of flow temperature circuit return temperature at terminals X25.11/X25.12: See sensor in secondary circuit, sensor "Controller and sensor PCB". minus 5 K. If the secondary circuit flow ■...
  • Page 11 Messages Messages (cont.) Messages System characteristics Cause Measures Compressor 1 in a 2-stage The stop limit for the hot Check the compressor oil level. ■ refrigerant circuit is switched gas temperature at com- Top up with oil if required. off. pressor 1 is exceeded.
  • Page 12 Messages Messages (cont.) Messages System characteristics Cause Measures Flow temperature in heat- Short circuit, system flow Check resistance value ■ ing circuit without mixer temperature sensor (NTC 10 kΩ) at plug F13: See A1/HC1 is controlled via the (downstream of buffer cyl- "Controller and sensor PCB".
  • Page 13 Messages Messages (cont.) Messages System characteristics Cause Measures If only the upper cylinder Lead break, top cylinder Check resistance value ■ temperature sensor is temperature sensor (NTC 10 kΩ) at plug F6 or at termi- present: No DHW heating nals X25.5/X25.6: See "Controller If an additional lower tem- and sensor PCB".
  • Page 14 Messages Messages (cont.) Messages System characteristics Cause Measures For central heating: Lead break, buffer tem- Check resistance value Buffer cylinder is heated perature sensor (NTC 10 kΩ) at plug F4: See "Con- ■ once every hour. troller and sensor PCB". Heating stops when the ■...
  • Page 15 Messages Messages (cont.) Messages System characteristics Cause Measures No cooling mode Short circuit, room tem- Check resistance value perature sensor, cooling (NTC 10 kΩ) at plug F16 (see circuit "Controller and sensor PCB") or at the remote control. No frost protection mode Lead break, room temper- Check remote control.
  • Page 16 Messages Messages (cont.) Messages System characteristics Cause Measures No solar DHW heating with Lead break, collector tem- Check sensor 6 at solar control solar control module, type perature sensor, solar module, type SM1: See installation control module, type SM1 and service instructions for "Solar control module, type SM1".
  • Page 17 Messages Messages (cont.) Messages System characteristics Cause Measures Compressor 2 in a 2-stage One of the following Calling up further heat pump ■ refrigerant circuit is switched events has occurred 9 messages: "Message history" off. times: Observe messages from the ■...
  • Page 18 Messages Messages (cont.) Messages System characteristics Cause Measures Compressor is switched off. Heat pump faulty Calling up further heat pump ■ ■ ■ Central heating and DHW Safety high pressure messages: "Message history" ■ ■ heating occurs with other switch has responded: Observe messages from the ■...
  • Page 19 Messages Messages (cont.) Messages System characteristics Cause Measures Compressor remains off Flow or return tempera- Provide additional heating water ■ ■ until the flow temperature in ture in the secondary buffer cylinder in the secondary cir- the secondary circuit has circuit too low during de- cuit return.
  • Page 20 Messages Messages (cont.) Messages System characteristics Cause Measures Inadequate change of tem- Circulation pump for cyl- Measure the voltage at the follow- ■ perature in the DHW cylinder inder heating faulty ing connections: Flow rate in cylinder Vitocal 300-A: ■ ■...
  • Page 21 Messages Messages (cont.) Messages System characteristics Cause Measures No communication via LON Wrong LON communi- Replace LON communication ■ ■ cation module module. Incorrect wiring in LON Check wiring in LON and correct ■ ■ if required. Compressor stops. Compressor power supply Check connections, power supply fault or phase monitor and phase connection.
  • Page 22 Messages Messages (cont.) Messages System characteristics Cause Measures Compressor is switched off. Refrigerant circuit fault: Check flow and return tempera- ■ ■ Central heating and DHW Safety high pressure ture sensors in primary and sec- ■ ■ heating occurs with other switch has responded.
  • Page 23 Messages Messages (cont.) Messages System characteristics Cause Measures Compressor stops. Primary circuit pressure Check safety equipment at termi- ■ ■ switch, frost stat or flow nals X3.8 and X3.9: See "Cross switch has responded. connect PCB"/"Luster terminals". Faulty power supply to In systems without safety equip- ■...
  • Page 24 Messages Messages (cont.) Messages System characteristics Cause Measures Compressor stops. Compressor fault: Check compressor power con- ■ Separate motor over- nections. Check the winding re- ■ load relay on compres- sistance of the compressor mo- sor (if installed) has re- tor.
  • Page 25 Messages Messages (cont.) Messages System characteristics Cause Measures Compressor stops. Low pressure fault: Clean the evaporator. ■ Heat pump faulty Check fan. ■ ■ Low pressure switch has Check pressure gauge, primary ■ ■ responded. pump and shut-off facilities. Low pressure sensor Check low pressure switch/ ■...
  • Page 26 Messages Messages (cont.) Messages System characteristics Cause Measures Compressor stops. High pressure fault: Vent heating circuit. ■ Air in heating circuit Check the system pressure. ■ ■ Secondary pump or Check secondary pump and ■ ■ heating circuit pump heating circuit pumps. blocked Flush heating circuits.
  • Page 27 Messages Messages (cont.) Messages System characteristics Cause Measures Compressor stops. Minimum flow rate in sec- Check secondary circuit flow ■ ondary circuit is under- rate. shot: See heat pump Check secondary pump. ■ specification. If no flow switch is installed, insert a jumper across X3.3/X3.4: See Heat pump specifi- "Luster terminals"...

  • Page 28: Keyword Index

    Keyword index Frost protection............8 Viessmann Climate Solutions SE Viessmann Limited 35108 Allendorf / Germany Hortonwood 30, Telford Telephone: +49 6452 70-0 Shropshire, TF1 7YP, GB Fax: +49 6452 70-2780 Telephone: +44 1952 675000 www.viessmann.com Fax: +44 1952 675040 E-mail: info-uk@viessmann.com...

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