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CAHA Midi
Installation, Usage and Maintenance Instructions
8.2 DHW ERRORS
Boiler does not respond to DHW heat request
- Check the storage tank-NTC or thermostat and its wiring (also see electrical wiring diagram).
- Check if DHW is enabled using the control panel
Insufficient DHW flow
- Dirty filters in taps.
- Insufficient water pressure.
DHW temperature too low
- Tapping flow too high
- Temperature set point too low
- 3 way valve not fully in DHW position
- Faulty DHW pump
- DHW operation set to off
- Storage tank-NTC or thermostat and or wiring defect.
- Input too low due to too much resistance in air/flue system.
Boiler operates only for DHW
- Storage tank-NTC or thermostat defect and or its wiring.
- 3-way valve stuck (remains in direction towards storage tank)
8.3 CH-ERRORS
CH circuit stays cold
- Incorrect connection to the mains electricity supply
- Main switch on control panel is switched off (boiler off).
- Room thermostat defect, incorrect wiring, temperature set too low
- Outdoor sensor and/or its wiring defect.
- CH operation off
- 3-way valve defect (remains in direction towards storage tank)
8.4 ERRORS (HARD AND SOFT LOCKOUTS)
Errors are indicated by a text and an E-code on the bottom line on the display.
The error message can be displayed by pressing the ”information” button
Following an error with a hard lockout, the boiler will not fire again until a manual reset is performed (eg max temp limit).
These errors can be found under column “hard lockout code” in the following table.
Following an error with a soft lockout, the boiler will automatically resume normal operation after the cause of block is
solved (eg gas pressure too low). They can be found under column “soft lockout code” in table beneath.
The cause of error (hard or soft lockout) can be found with the help of the error-list in the following table.
After the cause of error has been determined and the error has been resolved, the boiler can be put back into operation
again.