Maximum Average Δt Of T1 Supply Sensor Is Repeatedly Exceeded - Rinnai Q series Troubleshooting Manual

Maximum average ΔT of T1 supply
sensor and T2 return sensor for central
heating is repeatedly exceeded.
Rectify Issue,
Check following
1. Check flow through the heating system.
2. Possible causes: radiator shut off valves closed, blocked water filter.
3. Verify proper installation of the boiler plumbing, connections and all components.
4. Check minimum and maximum temperature difference in Parameter step 46 and 47.
5. Activated room sensor (RS100) in non leading room (closed thermostatic radiator
valves?) Check pump height. Should this be check pump head? Do not understand
BL 11
Operation is normally possible for the hot water
supply during the block. The pump continues to
operate at minimum capacity during the block.
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008082013GW