tekmar 422 Universal Reset Module - Manual (Page 31)

31 of 32 © 2007 D 422 - 08/07
Symptom Possible Causes Corrective Action
Boiler does not fire
when there is a DHW
or Setpoint Demand
No voltage present on demand
terminals. Test voltage across demand terminals using
voltmeter.
Control in Unoccupied and DHW
Unoccupied or Setpoint Unoccupied set
to OFF.
Check which schedule the 422 is operating on.
Boiler contact is not connected to boiler
thermostat connection.
Trace wires from boiler contact to boiler thermostat
connection. Use the Test sequence to check the
boiler contact.
Mixing valve will not
open.
No voltage present on actuator motor. Mix 1 Mode setting must be set to FLt.
Boiler Return Protection.
Mixing valve will not open until the boiler supply
temperature exceeds the boiler minimum setting.
Actuator rotating in wrong direction to
open valve
Reverse open and close wires on actuator.
Variable speed
injection pump does
not operate.
No current present on variable speed
injection pump.
Mix 1 Mode setting must be set to VAr.
Boiler Return Protection.
Variable speed injection pump will not operate until
the boiler supply temperature exceeds the boiler
minimum setting.
A non-wet rotor pump has been installed.
Variable speed injection will only operate with wet
rotor pumps. Read E 021 and check pump type.
Fuse is blown.
Determine if pump is jammed or seized. Replace
fuse.
Display is not on.
No voltage to control.
Check breaker panel or disconnect. Check voltage
using a voltmeter.
Plugs are not connected between the
422 to the Zone Manager. Ensure the plugs are secured to the Zone
Manager pins.
Fuse is blown.
Check fuse on Zone Manager. Check total
VA draw on all thermostats and zone valves
connected to the Zone Manager. This cannot
exceed 40 VA.
Troubleshooting
Error Message Description
BOILER BUS AND RETURN SENSOR CONFLICT
There is a DIP switch settings conflict. The Boiler DIP switch is set to Ret and the tN4 bus DIP
switch is set to Boiler. Once the Boiler DIP switch is set to Sup or the tN4 bus DIP switch is set
to Mix 2, the error message clears.
tekmar STAGER SETTING CONFLICT
There is a DIP switch settings conflict. The tekmar Stager DIP switch is set to On and the Boiler
Sensor DIP switch is set to Ret. Once the Boiler Sensor DIP switch is set to Sup or the tekmar
Stager DIP switch is set to Off, the error message clears.
DEVICE ERROR AT ADDRESS #:##
#:## is the address of the device with the error. The bus number displays before the colon,
and the device number displays after. Go to the device with the address displayed.
Possible Addresses:
b:01 to b:24 - Device Error on Boiler Bus
1:01 to 1:24 - Device Error on Bus 1
2:01 to 2:24 - Device Error on Bus 2
Error Messages (3 of 3)