Ariston Appliance Repair in St David's

What does error code 202 mean on an Ariston boiler?

Error code 202 on an Ariston boiler (Clas HE Evo, E-Combi Evo, E-System Evo models) indicates the secondary bottom storage temperature probe has an open or short circuit. Switch off the boiler and contact a Gas Safe registered engineer to inspect and replace the temperature sensor.

What does error code 411, 412, 413 or 414 mean on an Ariston boiler?

Error codes 411, 412, 413 or 414 on an Ariston boiler (multi-zone systems) indicate a room sensor circuit fault in zones 1 to 3. Switch off the boiler and contact a Gas Safe registered engineer to check the zone sensor wiring and connections.

What does error code 902 mean on an Ariston heat pump?

Error code 902 on an Ariston heat pump (Nimbus series) indicates the separator flow sensor is faulty - the delivery sensor is not connected or defective. Switch off the heat pump and contact a qualified heat pump installer to check and replace the flow sensor.

What does error code 109 mean on an Ariston boiler?

Error code 109 on an Ariston boiler (Clas Net ONE, Clas ONE Combi, Clas System ONE models) indicates the system pressure exceeds 3 bar. With the boiler switched off, bleed a radiator to release some water and reduce pressure. If pressure remains high, contact a Gas Safe registered engineer to check the expansion vessel.

What does error code 924 mean on an Ariston heat pump?

Error code 924 on an Ariston heat pump (Nimbus series) indicates a communication error with the heat pump outdoor unit. Switch off the heat pump and check all cable connections between indoor and outdoor units. Contact a qualified heat pump installer if the error persists.

Why is my Ariston electric water heater making unusual noises?

Unusual noises typically indicate limescale buildup inside the tank, which is common in hard water areas. This buildup increases heating times and energy costs. Do not attempt to inspect or repair the unit yourself. Contact a qualified technician for descaling and inspection. Always ensure the water heater is switched off at the electrical supply before any maintenance work is carried out by a professional.

What does error code 604 mean on my Ariston boiler?

Error code 604 indicates the fan is not turning at the correct speed. This is a serious safety issue as the fan cannot properly expel combustion gases including carbon monoxide. Do not use the boiler until it has been inspected and repaired by a Gas Safe registered engineer. If you experience headaches, dizziness, or nausea, ventilate the area immediately and seek medical attention.

How do I drain my Ariston Nuos heat pump water heater?

Turn off power to ensure the unit is not operated when empty. Turn off the cold water supply, shut off the hot water feed, connect a hose to the drain cock and place the other end in a sink or basin, then open the drain cock and the temperature/pressure relief valve to vent the cylinder.

Why is ice building up on my Ariston Nimbus heat pump outdoor unit?

Some frost is normal in cold weather, but excessive ice buildup indicates the defrost cycle is not working properly. This can damage the compressor and reduce efficiency. Check that airflow around the outdoor unit is not blocked by debris, leaves, or snow. If ice persists, contact a qualified heat pump installer to check the defrost sensors and system.

What is a modulating thermostat and how does it work?

A modulating thermostat uses advanced technology to communicate with your boiler in real time, maintaining constant temperatures by adjusting the boiler's output based on heating needs rather than simply turning it on and off.