Xylem EHR IM Electrical heater series EHR (obsolete) - Manual (Page 11)

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14.) Indication LEDs
Green Red Yellow
Main switch on, on off off
no heat request
Pump on, on off on
heat request
Set feed temperature on off blinking
reached
Excess temperature on on off
cut out
13.) Troubleshooting
The EHR series is generally very reliable. If the unit
nevertheless is not operating , first check, whether it is wired
properly and whether the system is filled and properly
primed.
What to do when the unit gives no heat
- check setting and wiring of a room thermostat or timer, if
connected to the unit. The output of the room thermostat or
timer has to be a no loaded one (potential free) and has to
be closed, if heat is required.
- check the temperature setting of the EHR itself.
- If the LEDs show temperature cut out, reset it by pushing
ist knob.(Caution: If a safety temperature cut out has
tripped, you must investigate and correct the cause)
What to do when the heating performance is unsatisfactory:
- check design heating requirement
- check setting of a room thermostat or timer, if connected to
the unit.
- check temperature setting of EHR