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Bridge or Thermostat
Connection
TA 1. Zone Thermostat
TA 2. Zone Thermostat
Bridge or Thermostat
Connection
Is the mode in the Winter position?
Are the Timer and the Room Thermostat switched on?
Are the Radiator Valves Open?
Is the room thermostat bridge is connected (A)?
Only for models with No Timer.
Select the Winter position
Switch the Timer and Room Thermostat On
Open the Radiator Valves
There is no Voltage from the Timer/Room Stat.
This is not boiler fault. Ensure Voltage is
supplied to boiler by rectifying external wiring.
NO
NO
NO
NO
YES
YES
YES
NO CH OPERATION / DHW WORKS
4.12. NO CH OPERATION / DHW WORKS
Designation
Manufacturer
Type-model / Technical data
Release date
28.11.2017
Fault Finding; No CH Operations but DHW works
Warmhaus
Viwa 90-115-125-150
Rev. No:
0
Drw. No:
WH.17.733