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Plumbing and Gas News

Practical tips for maintenance, service and repairs of plumbing and gas appliances

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Maintenance and Service


Trevi Therm MK2 - no hot water

The hot water is running cold from the shower. Trevi Therm thermostatic cartridge assembly (S960134NU) need replacement. To replace the cartridge you don't need to isolate water supply just close it. To dismantle the cartridge you need to undo 1 screw and remove 2 securing clips. Pull out a cartridge extension and a pressure adjustment handle. Then with a spanner unscrew the cartridge assembly from the valve. You can order the cartridge from here.



Worcester Greenstar 24i Junior - timer is not working

The boiler works fine when you put it on constantly on and if you want to turn it off but doesn't work on timer. The most likely you need to replace the mechanical timer. Turn the electricity off and remove the boilers cover. This is a very easy part to change. Unscrew one screw holding it and pull it upwards. Disconnect the wires and plug in the new one. The part number for the mechanical clock for Worcester Bosh is 7716192036 and it can be ordered from here

Boiler manual: PDF



Ariston Eurocombi A23 MFFI - The hot water is lukewarm

The water from a hot tap is lukewarm and keeps fluctuating. First of all we need to check the burner pressure of the boiler. Remove the from cover and connect the U-gauge to a P2 test point on a gas valve. Open the hot tap and with the boiler on check the burner pressure. It should be 11 mbar. If it is then we need to test the hot water thermistor. Unplug the wire and measure resistance between two connectors. It should be 12 kOhms at 12°C. If it is then we need to test the plate heat exchanger. Open a hot tap and touch the heat exchanger. If within 20 seconds it gets scalding hot then its blocked and need cleaning or replacing. The part number for the heat exchanger is 571646 and can be ordered from here

Boiler manual: PDF



Hansgrohe DN15 - Poor pressure

The pressure from a shower is very poor and you can fill stiffness when opening the valve. The insert inside the shut off valve has got rusty or the washer has slipped off. Isolate the water supply to the valve. Undo the middle nut anticlockwise to remove the handle and get access to the shut off unit. Using hexagon key unscrew the insert. Lubricate it with silicone grease or replace with a new one. The part number is 94142000 Hansgrohe Genuine 94142 Shut off unit with spindle ½ counter clockwise open 270 Axor Pharao Allegra Duo Plus and can be ordered from here



Ideal Elan RS30 - Boiler is not firing up

The boiler's pilot light is on and the there is a power supply to it but the boiler is not firing when heating is on. To test a gas valve turn the heating on and turn the boiler thermostat on. Check voltage between brawn and blue wires to the gas valve. If there is 240V across then the gas valve is faulty and need replacement. The part number is 078560 (GCN: 41-407-96) and it can be ordered from here. Part number from boiler manual is 586731900 (GCN: 395685).

Boiler manual PDF 


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