De Dietrich · Error codes
De Dietrich error codes and alerts
Identical code numbers can mean different things on different controllers, so every entry is tied to the documented series, controller and manual version. A code is never a diagnosis.
If you smell gas
- Stop what you are doing. Do not use phones, switches, matches or anything that can spark inside.
- Go outside and leave the door open behind you.
- Call the FortisBC 24-hour emergency line at 1-800-663-9911 or dial 911.
Only after that, call ROMA about the boiler. Official guidance: FortisBC gas leaks and odour.
De Dietrich MCA Pro wall-hung condensing boilers (Comfort Master error codes, ISM section 8.1)
E:00
Storage unit PSU parameter not found. Probable causes: Bad connection. Checking / solution: Check the wiring. The table classifies it as Err…
Details
E:01
The safety parameters are incorrect. Probable causes: Bad connection • PSU defective. Checking / solution: Check the wiring • Replace PSU. T…
Details
E:02
Supply temperature sensor short circuited. Probable causes: Bad connection • Sensor fault • Sensor not or badly connected. Checking / soluti…
Details
E:03
Supply temperature sensor open circuit. Probable causes: Bad connection • Sensor fault • Sensor not or badly connected. Checking / solution:…
Details
E:04
Temperature of heat exchanger too low. Probable causes: Bad connection • Sensor fault • Sensor not or badly connected • No circulation. Chec…
Details
E:05
Exchanger temperature too high. Probable causes: Bad connection • Sensor fault • Sensor not or badly connected • No circulation. Checking / …
Details
E:06
Return temperature sensor short circuited. Probable causes: Bad connection • Sensor fault • Sensor not or badly connected. Checking / soluti…
Details
E:07
Return temperature sensor open circuit. Probable causes: Bad connection • Sensor fault • Sensor not or badly connected. Checking / solution:…
Details
E:08
Return temperature too low. Probable causes: Bad connection • Sensor fault • Sensor not or badly connected • No circulation. Checking / solu…
Details
E:09
Return temperature too high. Probable causes: Bad connection • Sensor fault • Sensor not or badly connected • No circulation. Checking / sol…
Details
E:10
Difference between the supply and return temperatures too great. Probable causes: Sensor fault • Sensor not or badly connected • No circulat…
Details
E:11
Difference between the supply and return temperatures too great. Probable causes: Sensor fault • Sensor not or badly connected • No circulat…
Details
E:12
Temperature of heat exchanger above normal range (high-limit thermostat STB). Probable causes: Bad connection • Sensor fault • Sensor not or…
Details
E:14
5 burner start-up failures. Probable causes: No ignition • Presence of the ignition arc but no flame formation • Defective control SU PCB. C…
Lockout
E:16
False flame signal. Probable causes: Presence of the flame but insufficient ionization (<3 μA) • Ionization current present when there shoul…
Lockout
E:17
Problem on the gas valve SU PCB. Probable causes: Bad connection • Defective SU PCB. Checking / solution: Check the wiring • Inspect the SU …
Details
E:34
Fan fault. Probable causes: Bad connection • Fan defective. Checking / solution: Check the wiring • Replace the fan if need be • Check for a…
Details
E:35
Supply and return reversed. Probable causes: Bad connection • Sensor fault • Sensor not or badly connected • Water circulation direction rev…
Details
Talk to a boiler technician
Describe what the boiler is doing and get a straight answer about the next step.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.