Thermostat shows 'Battery Critical' and may shut down intermittently

Safety first: This is a battery-only issue; no mains work required.

• Immediate replacement: Replace all batteries immediately with new alkaline cells. Do not continue using the thermostat with critical battery warnings.
• Improve RF signal: If the thermostat is far from the receiver, move it closer or improve line-of-sight to reduce RF retransmissions that drain batteries.
• Check for warmth: If the thermostat feels unusually warm, remove batteries and contact Hive support, as an internal fault may be causing excess current draw.
• Monitor life: After replacement, monitor how long the new batteries last. If less than a few months, the thermostat likely has a hardware fault.