Been without HW for over 6 months. Finally diverter valve started leaking so sprung my lazy ass into motion - changed 3 way divertor OK.
Central Heating 'appears' to be functioning except I notice that primary heating cct does not reach 80deg - only 70deg - ALL dials set at max (HW and CH)
Running HW with CH on with primary loop at 70deg results in surge of hot water at tap but LEDs slowly indicate falling primary temperature. Burner running all the while.
At sufficiently low rate (very low) I can run a bath to 40deg but if not careful HW flow will pull primary temp down to 30 deg resulting in very luke warm water.
Manual suggests checking mudulation. I observe non, but to be honest I can't say if it is stuck at max or min, no frame of reference !
I have tested terminal voltage at the Gas Valve modulating terminals to find 24V. THe manual suggest a maximum of 9v and a minimum of 1v. Thus I conclude both pcb AND gas valve are faulty???? As at 24V I should have high gas flow burning to feed heating cct BUT at the same time I must conclude that the pcb is faulty since manual says max 9v ???
I presume the HW sensor to be working since when water is running hot (55deg) on LOW flow and I turn the setting dial down - the burner cuts out.
Initially I had suspected a blocked heat exchanger as the system has never had any anti-corrosion fluid in it. I have been running some cleaner for 48 hrs in the system with little difference.
I really need to be able to force the modulation some how or get answers with regards to the anomollous voltages. In a forum post found by google it suggested that Baxi says the modulation voltage max is 24V.
Central Heating 'appears' to be functioning except I notice that primary heating cct does not reach 80deg - only 70deg - ALL dials set at max (HW and CH)
Running HW with CH on with primary loop at 70deg results in surge of hot water at tap but LEDs slowly indicate falling primary temperature. Burner running all the while.
At sufficiently low rate (very low) I can run a bath to 40deg but if not careful HW flow will pull primary temp down to 30 deg resulting in very luke warm water.
Manual suggests checking mudulation. I observe non, but to be honest I can't say if it is stuck at max or min, no frame of reference !
I have tested terminal voltage at the Gas Valve modulating terminals to find 24V. THe manual suggest a maximum of 9v and a minimum of 1v. Thus I conclude both pcb AND gas valve are faulty???? As at 24V I should have high gas flow burning to feed heating cct BUT at the same time I must conclude that the pcb is faulty since manual says max 9v ???
I presume the HW sensor to be working since when water is running hot (55deg) on LOW flow and I turn the setting dial down - the burner cuts out.
Initially I had suspected a blocked heat exchanger as the system has never had any anti-corrosion fluid in it. I have been running some cleaner for 48 hrs in the system with little difference.
I really need to be able to force the modulation some how or get answers with regards to the anomollous voltages. In a forum post found by google it suggested that Baxi says the modulation voltage max is 24V.