Had a problem with our boiler today - managed to fix it.
FYI
Problem:
1. No Hot Water - on Demand (When Tap is opened), water pressure higher than normal.
2. If pre-heat is on - water is heated automatically whilst tap is closed, when tap is open there is hot water for about 10 seconds and then freezing cold water.
3. Central Heating Working.
4. Can't advise if boiler was firing up or not.
5. Tried all combinations CH+DHW no Hot water.
Panic - Tried: New Diverter Valve = £91.00 inc. - problem not fixed,
bought a diaphragm kit - £5.00, but did not know where it required to be fitted.
Stopped - Tried figuring out how the boiler worked!!! - good starting point.
Cause:
1. When tap opened - Noticed no demand lights (Green & yellow lights both off).
2. Managed to borrow manuals from family friends who have the same boiler/manuals. Checked diagnostics info, i & + = d.22 = 0 when hot tap open (should be 1 to confirm water demand)
Action:
1. On water incoming to boiler (after water service valve) there is an aqua sensor assembly, which was not detecting water flowing through boiler when hot tap is opened, hence no hot water, boiler = demand not present. So the cold mains water passed straight through boiler and out of hot water tap.
2. Isolated power, Closed all service valves, depressurised system.
3. Removed circlip on aqua sensor
4. Removed propeller and cleaned - contained a bit of grit.
5. Removed the breather nut on top of aqua sensor housing, which was blocked - cleaned and blew through it to ensure it was open.
6. Refitted in reverse order.
7. Refilled boiler.
8. Opened service valves
9. Power ON - Opened Hot water tap, green light flashing & yellow on = Hot water!!!!!!
Aqua sensor is in two parts,
The operational principle I understood as follows:
- the reciever (RX) the sensor (fitted on outside of housing and has three wires)
- propellar - the transmitter - as water flows through the housing the propeller spins, and produces an oscillating signal which is picked-up by the RX, the faster the propellor spins the higher the frequency and the greater the demand for hot water.
As the propellor was not spinning before, there was no demand, hence the cold water.
Regards
Faisal
FYI
Problem:
1. No Hot Water - on Demand (When Tap is opened), water pressure higher than normal.
2. If pre-heat is on - water is heated automatically whilst tap is closed, when tap is open there is hot water for about 10 seconds and then freezing cold water.
3. Central Heating Working.
4. Can't advise if boiler was firing up or not.
5. Tried all combinations CH+DHW no Hot water.
Panic - Tried: New Diverter Valve = £91.00 inc. - problem not fixed,
bought a diaphragm kit - £5.00, but did not know where it required to be fitted.
Stopped - Tried figuring out how the boiler worked!!! - good starting point.
Cause:
1. When tap opened - Noticed no demand lights (Green & yellow lights both off).
2. Managed to borrow manuals from family friends who have the same boiler/manuals. Checked diagnostics info, i & + = d.22 = 0 when hot tap open (should be 1 to confirm water demand)
Action:
1. On water incoming to boiler (after water service valve) there is an aqua sensor assembly, which was not detecting water flowing through boiler when hot tap is opened, hence no hot water, boiler = demand not present. So the cold mains water passed straight through boiler and out of hot water tap.
2. Isolated power, Closed all service valves, depressurised system.
3. Removed circlip on aqua sensor
4. Removed propeller and cleaned - contained a bit of grit.
5. Removed the breather nut on top of aqua sensor housing, which was blocked - cleaned and blew through it to ensure it was open.
6. Refitted in reverse order.
7. Refilled boiler.
8. Opened service valves
9. Power ON - Opened Hot water tap, green light flashing & yellow on = Hot water!!!!!!
Aqua sensor is in two parts,
The operational principle I understood as follows:
- the reciever (RX) the sensor (fitted on outside of housing and has three wires)
- propellar - the transmitter - as water flows through the housing the propeller spins, and produces an oscillating signal which is picked-up by the RX, the faster the propellor spins the higher the frequency and the greater the demand for hot water.
As the propellor was not spinning before, there was no demand, hence the cold water.
Regards
Faisal
