A.00.00 error code
A.00.00 — Flow temperature sensor open or below range
What does Remeha Gas 320/620 Ace floor-standing boiler A.00.00 mean?
Remeha documents A.00.00 for the Gas 320/620 Ace as “Flow temperature sensor open or below range”. The boiler may continue operating, but the cause should be investigated.
The code identifies the condition detected by the product; it does not always identify the failed component on its own. Confirm the full code and exact model before ordering parts or attempting a reset.
The Remeha Gas 320/620 Ace floor-standing boiler A.00.00 error code indicates remeha documents A.00.00 for the Gas 320/620 Ace as “Flow temperature sensor open or below range”. The boiler may continue operating, but the cause should be investigated. This guide explains what the code means, the symptoms and likely causes, the checks that are safe to make, and when to stop and arrange an authorised repair.
Symptoms you may notice
The Gas 320/620 Ace displays this code and may suspend or lock out operation. Temperature or pressure information from the affected sensor is outside its valid range.
Common causes
A disconnected, incorrectly fitted, open-circuit or short-circuited sensor; damaged wiring or connectors; a defective sensor; or an associated control-input fault.
Before you start troubleshooting
Use the display, rating label or product menu to confirm the exact model. Similar-looking codes can have different meanings across product generations and regions.
- Record the complete code before switching the equipment off.
- Check only user-accessible controls, filters and external connections described in the manual.
- Do not open gas, refrigerant, combustion or electrical compartments.
Troubleshooting steps
Record the complete code. A qualified engineer should check the sensor installation, wiring and connectors, measure the sensor against the manual specifications and replace it only when testing confirms failure.
Can you fix this error code yourself?
This fault is not intended for user repair. Do not remove covers or test internal components; record the code and contact an authorised technician.
A successful reset is not proof that the underlying issue is fixed. If A.00.00 reappears, note when it happens and give that information to the service engineer.
Reset instructions
Do not reset merely to clear the display. Record the code and correct the cause.
Applicable products and models
Gas 320/620 Ace floor-standing boilerGas 320 Ace; Gas 620 AceCurrent and supportedWhen to contact a professional
Contact a qualified Remeha commercial-heating engineer if the message returns, the boiler is locked out, a safety limit has operated, or checks require access to internal components.
Frequently asked questions
What does Remeha Gas 320/620 Ace floor-standing boiler A.00.00 mean?
Remeha documents A.00.00 for the Gas 320/620 Ace as “Flow temperature sensor open or below range”. The boiler may continue operating, but the cause should be investigated.
Can I fix Remeha Gas 320/620 Ace floor-standing boiler A.00.00 myself?
This code is not classed as user-fixable. Record it and arrange authorised diagnosis rather than opening the product.
Should I reset the product after code A.00.00?
Do not reset merely to clear the display. Record the code and correct the cause.
When should I arrange a repair?
Contact a qualified Remeha commercial-heating engineer if the message returns, the boiler is locked out, a safety limit has operated, or checks require access to internal components.