A.O. Smith Theta T Series, Installation, User And Service Manual

Page: 93 / 109

Installation-, User- and Service Manual
93
Indication Cause Measure Remark
Heating system stays
cold
(2/2)
Pump from heating system is
not functioning. Check whether the (heating) pump is correctly connected. If there continues to be insufficient or no hot water,
consult your installation engineer.
Check whether there is power on the (heating) pump
connections on the controller of the Theta dual service module.
The measured voltage must be 230 V
AC
(-15%, +10%)
Check the (hydraulic) operation of the (heating) pump:
1. Bleed the pump, when air is present.
2. Unblock the pump of replace the pump in case of seizing.
Pump from DHW-system is
not functioning. Check whether the (DHW) pump is correctly connected.
Check whether there is power on the (DHW) pump connections
on the controller of the Theta dual service module. The
measured voltage must be 230 V
AC
(-15%, +10%)
Check the (hydraulic) operation of the (DHW) pump:
1. Bleed the pump, when air is present.
2. Unblock the pump or replace the pump in case of seizing.
3-way mixing valve is not
functioning. Check whether the 3-way mixing valve is connected (electrical).
Check whether there is power on the (3-way mixing valve)
connections on the controller of the Theta dual service module.
The measured voltage must be 230 V
AC
(-15%, +10%)
Check whether the 3-way mixing valve is correctly (hydraulically)
connected.
Check whether the 3-way mixing valve is correctly configurated
(11.5 "Configuration 3-way mixing valve").