tekmar 257 DHW Control - Manual (Page 11)

11 of 12 © 2009 D 257 - 03/09
Field Test
To test the control, push and hold the up button for 3
seconds while in the default menu. While in Field Test
“tSt” is displayed.
Step 1: Heat 1 relay will close and Heat 2 relay will open
for 10 seconds
Step 2: If rotate switch is off, both Heat 1 and Heat 2 relays
will close for 10 seconds. If rotate switch is on, Heat
1 relay will open and Heat 2 relay will close for 10
seconds.
Step 3: The test routine ends and the control resumes normal
operation.
Item
Stage Mode Delay
Target DHW
Differential DHW
Error Messages
Stage Mode Delay
Target DHW
Differential DHW
EEPROM READ ERROR
The control was unable to read a piece of information stored in it’s memory. Because
of this, the control was required to reload factory settings for all items in the PRGM
menu. The control will stop operation until all of the items in the PRGM menu have
been checked.
Stage Mode Delay
Target DHW
Differential DHW
DHW SENSOR ERROR
The control is no longer able to read the DHW Sensor due to an open or short circuit.
Locate and repair the problem as described in the Data Brochure D 070. The outputs
will not operate until the error is cleared.