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Features Benefits
30 and 60kW single burners and twin burners between 90 and 120kW With fewer burners both commissioning and planned maintenance costs are minimised. Offering in-built redundancy and flexibility (90 and 120kW twin burners).
Independent service valves and pressure sensors on each heat exchanger in twin burner versions Full built in redundancy and service flexibility as burners and heat exchangers can be isolated.
Low NOx burners Compliant with and exceeds current legislative requirement.
High efficiency modulating pumps (ErP rated A) Improved operating efficiencies with greater temperature control.
Multi-line graphical display Access to live data, settings and history. Easy to use with full control of the burners and accurate charging of integral tank.
Ready to connect into BMS via Modbus protocol Easy integration into BMS for remote monitoring and control; identifies specific problems and maximises maintenance efficiency.
Full anti-legionella functions with strap-on sensor as standard Control of secondary return circuit temperature and pump operation.
Features
30 and 60kW single burners and twin burners between 90 and 120kW
Independent service valves and pressure sensors on each heat exchanger in twin burner versions
Low NOx burners
High efficiency modulating pumps (ErP rated A)
Multi-line graphical display
Ready to connect into BMS via Modbus protocol
Full anti-legionella functions with strap-on sensor as standard
Benefits
With fewer burners both commissioning and planned maintenance costs are minimised. Offering in-built redundancy and flexibility (90 and 120kW twin burners).
Full built in redundancy and service flexibility as burners and heat exchangers can be isolated.
Compliant with and exceeds current legislative requirement.
Improved operating efficiencies with greater temperature control.
Access to live data, settings and history. Easy to use with full control of the burners and accurate charging of integral tank.
Easy integration into BMS for remote monitoring and control; identifies specific problems and maximises maintenance efficiency.
Control of secondary return circuit temperature and pump operation.
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30 and 60 kW Single Burner

CWH 30/201 CWH 30/301 CWH 60/201 CWH 60/301
  Product Code 7726948 7726950 7726949 7726951
Performance
Maximum Heat input net (gross) kW 28(31) 28(31) 56(62) 56(62)
Heat output kW 30.5 30.5 61 61
Gross thermal efficiency % 98 98 98 98
Standby loss kWh/day 1.68 2.26 1.68 2.26
 ErP
 NOx emissions (0% 02) mg/kWh 39 39 36  36
 ErP efficiency rating   A A A A
 Water heater efficiency  %  95  98  91  97
 Noise level (EN15036-1 avg @1m)  dBA  53  63  53  63
Gas data
Gas flow rate (natural gas) m3/h 2.95 2.95 5.95 5.95
Gas flow rate (propane) m3/h 1.15 1.15 2.35 2.35
Water
Storage capacity litre 200 300 200 300
Recovery rate at 50ºC rise litre/hr 480 480 960 960
Recovery rate at 56ºC rise litre/hr 429 429 856 856
maximum operating pressure (unvented) bar 6 6 6 6
Minimum working pressure bar 0.8 0.8 0.8 0.8
Maximum pressure bar 7.5 7.5 7.5 7.5
Electrical
Fuse rating amp 5 5 5 5
Power consumption - standby W 3.5 3.5 3.5 3.5
Power consumption - max W 100 100 145 145
Electrical requirements V 220 - 240 @ 50 Hz 220 - 240 @ 50 Hz 220 - 240 @ 50 Hz 220 - 240 @ 50 Hz
Misc.
Weight full kg 370 485 380 490
Weight empty kg 155 165 170 180
Maxiumum outlet temperature C 65 65 65 65
Maximum flue gas temperature C 90 90 90 90
Connection sizes and Dimensions
Inlet/outlet connections BSP 1 1/2" 1 1/2" 1 1/2" 1 1/2"
Return connection BSP 1" 1" 1" 1"
Gas connection BSP 3/4" 3/4" 3/4" 3/4"
Water heater height mm 1556 1980 1556 1980
Diameter of water heater mm 602 602 602 602
Water Heater depth mm 1046 1046 1046 1046
Flue diameter - conventional flue mm 80 80 80 80
Flue diameter - concentric balanced flue mm 80/125 80/125 80/125 80/125
Service clearance
Front mm 800 800 800 800
Right side mm 200 200 200 200
Rear mm 200 200 200 200
Left side mm 300 300 300 300
Above mm 300 300 300 300
Shipping
Shipping width mm 880 880 880 880
Shipping depth mm 1160 1160 1160 1160
Shipping height mm 2213 2213 2213 2213
Shipping weight kg 224 239 234 239

90 and 120 kW Twin Burner

CWH 90/302 CWH 120/302
  Product Code 7726952 7726953
Performance
Maximum Heat input net (gross) kW 84 (93) 112 (124)
Heat output kW 91.6 122
Gross thermal efficiency % 98 98
Standby loss kWh/day 2.26 2.26
 ErP
 NOx emissions (0% 02) mg/kWh 39 36
 ErP efficiency rating   - -
 Water heater efficiency  %  91  90
 Noise level (EN15036-1 avg @1m)  dBA  62  65
Gas data
Gas flow rate (natural gas) m3/h 8.7 11.6
Gas flow rate (propane) m3/h 3.5 4.7
Water
Storage capacity litre 300 300
Recovery rate at 50ºC rise litre/hr 1440 1920
Recovery rate at 56ºC rise litre/hr 1286 1712
maximum operating pressure (unvented) bar 6 6
Minimum working pressure bar 0.8 0.8
Maximum pressure bar 7.5 7.5
Electrical
Fuse rating amp 5 5
Power consumption - standby W 5.5 5.5
Power consumption - max W 210 290
Electrical requirements V 220 - 240 @ 50 Hz 220 - 240 @ 50 Hz
Misc.
Weight full kg 485 505
Weight empty kg 185 205
Maxiumum outlet temperature C 65 65
Maximum flue gas temperature C 90 90
Connection sizes and Dimensions
Inlet/outlet connections BSP 1 1/2" 1 1/2"
Return connection BSP 1" 1"
Gas connection BSP 3/4" 3/4"
Water heater height mm 1980 1980
Diameter of water heater mm 602 602
Water Heater depth mm 1046 1046
Flue diameter - conventional flue mm 130 130
Flue diameter - concentric balanced flue mm 130/200 130/200
Service clearance
Front mm 800 800
Right side mm 200 200
Rear mm 200 200
Left side mm 300 300
Above mm 300 300
Shipping
Shipping width mm 880 880
Shipping depth mm 1160 1160
Shipping height mm 2213 2213
Shipping weight kg 254 274

New multi level BIM files now available for this product

Download your Building Information Modeling (BIM) object(s) for this product. If you can’t find the BIM file you require, or you have any questions, please contact your Area Sales Manager who will be able to help.

Download CAD files for this product using the links below. To access CAD files you will need the correct software installed to allow you to open .dwg files such as AutoCAD. If you can't find the CAD file you require, or you have any questions, please contact your Area Sales Manager who will be able to help.

Feel free to call our technical helpline on 0345 070 1055 if you need any support.


Error Code Error Code Description Diag. Code Notes
20 Boiler temperature 1, sensor error Other Boiler flow sensor (B2) is outside normal limits
439 Boiler flow sensor (B2) is short-circuit
440 Boiler flow sensor (B2) is open-circuit
26 Common flow temperature sensor error Any Check connections or replace faulty sensor located on common flow pipe work up stand section (B10)
28 Flue gas temperature, sensor error 539
543
Flue gas sensor (B8) is short-circuit
540
544
Flue gas sensor (B8) is open-circuit
40 Return temperature 1, sensor error Other Boiler flow sensor (B7) is outside normal limits
441 Boiler flow sensor (B7) is short-circuit
442 Boiler flow sensor (B7) is open-circuit
50 DHW temperature 1, sensor error Any Check connections or replace faulty DHW tank sensor (B3)
81 LPB short-circuit or no power supply Any LPB Short circuit or no bus power supply. Check operation of OCI345 modules and connecting cables
82 LPB address collision Any LPB address duplicated on another Control PCB - Check address of all control PCBs via parameter 6600
83 BSB short-circuit or no power supply Any No BSB communication or wires shorted - Check operation of GUI or OZW672 (if fitted)
84 BSB address collision Any Two appliances connected through BSB (e.g. OZW672) have the same allocation address. Change one of the appliances address via parameter 6600
98 Extension module 1, error Any AGU2.5 configuration error - Check parameters
99 Extension module 2, error Any AGU2.5 configuration error - Check parameters
100 More than one clock time master Any Only one device should be set as the time master, check on the GUI (parameter 6640) and any OZW672 connected (in case of connection to an OZW672, this device should be the master)
102 Clock master without power reserve Any The control PCB battery backup for the time clock has been depleted following the restoration of power to the heater. If this message has not cleared within 10 minutes of power being turned on, turn the power off, wait 10 seconds and turn the power on again. This message does not prevent the operation of the heater in any way.
105 Maintenance message Any Item requiring attention but not preventing appliance operation (e.g. 12 Month service due). Check details of message on the appliance Front GUI screen.
110 SLT Lockout Others General overheating issue. Check for pump operation, trapped air and heat exchanger blockages. Monitor temperatures of system to establish problem area. Check that the connector X18 (yellow looped wire) is in place on the control PCB
428
438
817
Maximum Delta T of primary system exceeded. Check that the flow and return sensors are operating correctly. Check pump operation and check for trapped air in the heat exchanger.
426
437
815
Flow temperature heat up gradient exceeded. Check pump operation and check for trapped air in the heat exchanger. Flow through heat exchanger may be restricted.
420
421
819
820
Return temperature greater than flow temperature. Check that the flow sensor is operating correctly and the pump direction is correct.
430
419
422
423
809
810
813
814
Flow temperature exceeded. Check pump operation and check for trapped air in the heat exchanger. Flow through heat exchanger may be restricted.
424
425
811
812
Return temperature outside plausible limits. Check return sensor (B7) and replace if necessary.
422
423
809
810
Flow sensor readings are outside plausible limits. Check flow sensor (B2) and replace if necessary.
111 Shutdown limit thermostat Any Heat exchanger temperatures have been exceeded. Investigate flow rates and controls to determine causes of temporary fault code.
125 Maximum boiler temperature exceeded Any Flow temperatures have been exceeded. Appliance will continue once temperatures have dropped below maximum allowed limits.
126 DHW charging temperature not reached Any Charging temperature never achieved. Check operation and heat up times for DHW.
127 DHW legionella temperature not reached Any Check operation of legionella function and DHW system. Legionella setpoint has not been achieved within 48 hours of the legionella function operating. If using a secondary return system and sensor, do not set the legionella function setpoint too high, as the heat losses around the hot water pipework may not permit this setpoint to be achieved.
128 Loss of flame during operation 394 Flame lost in operation within the first 7 seconds of the start of the modulation phase. Check the CO2 is set correctly and check operation and condition of ionisation electrode.
854 Flame lost in operation after the first 7 seconds of the start of the modulation phase. Check the CO2 is set correctly and check operation and condition of ionisation electrode.
625 Flame lost in operation more than 24 times in a 24 hour period. Check the preceding error codes for details on when the ionisation current was lost. Check the operation of the ionisation electrode, gas supply, and flue system. Check that there is sufficient gas available to the heater at all times.
130 Flue gas temperature too high Any Check causes of high temperatures before operating Appliance. Inspect inside of heat exchanger for dirt build up. Check CO2 levels at min and max output.
133 Safety time exceeded 395 Records individual ignition failures and the times they have occurred. Check gas supply, spark electrode, spark generator, Ionisation probe, CO2 setting and flue system.
625 A total of 5 unsuccessful ignition attempts has occurred within a 24 hour period. This is the point that the heater went into permanent lockout.
142 Device failure (Bus) Any Check that the appliance and OZW672 is powered and connected correctly.
151 BMU Internal error 330
331
Ignition output error. Check operation of spark generator. Re- place PCB if no fault with the spark generator found.
332
333
Gas valve output error. Check operation of gas valve. Replace PCB if no fault with the gas valve found.
Other Check if polarity of live and neutral has been reversed to the appliance. Replace PCB if fault repeatedly occurs.
152 Parameterization error Any Incorrect / conflicting parameters input (last changed parameters need to be investigated).
153 Unit Locked 622 Temperature inside the appliance casing has exceeded 90OC. Check heat engine door seals and door nuts are correctly tightened. Pressing the reset for more than 10 seconds will also produce this lockout.
848
849
Parameter update finished. Press reset to apply changes.
160 Fan speed threshold not reached Any Fan does not reach required speed setpoint via PWM control - Check wiring and operation of fan. Replace fan if necessary
377 Fan speed not reached - Home run stage.
378 Fan speed not reached - Standby stage.
379 Fan speed not reached - Ignition stage.
380 Fan speed not reached - Pre purge stage.
381 Fan speed not reached - Post purge stage.
162 Air pressure switch Any Air pressure switch has activated or is open circuit. Check for flue restriction or incorrect flue installation. Check air pressure switch function (operates at 365 Pa). Condense pipework may be blocked. Check the condensate pipe system is free to flow into the trap and beyond.
171 Fault input 1 Any User defined OZW672 input D1 has been activated.
172 Fault input 2 Any User defined OZW672 input D2 has been activated.
183 Unit in parameterisation mode Any Code will be displayed when a programming stick is used but should clear when programming is complete. Repeat stick operation if fault code persists.
217 Sensor error Any Ionisation current fault or short circuit. Check operation of ionisation probe using parameter 8329 (menu - Diagnostics heat generation). Ionisation probe may need replacing. Check earthing to the heater.
218 Pressure supervision Any Water pressure inside appliance is low but not yet critical. Appliance will continue to operate but at 80% of maximum output. Full output power will not be available until the water pressure is at or above 0.2 bar.
317 Mains frequency outside permitted range Any Check electrical supply to appliance.
322 Water press 3 too high Any Water pressure inside the appliance is too high for safe operation. Operation will automatically resume once water pressure is at or below maximum levels. Check that the appliance flow is not restricted or blocked, or the water isolator valves are shut off.
323 Water press 3 too low/td> Any Water pressure inside appliance is too low for safe operation. Operation will automatically resume once water pressure is at or above 0.1 bar.
324 Input BX, same sensors Any BX sensor duplicated - check parameters.
325 Input BX/extension module, same sensors Any BX extension module sensor duplicated - check parameters.
327 Extension module, same function Any AGU2.5 extension module function duplicated - check parameter setup for the AGU2.5 extension module (“Configuration” menu).
335 Sensor input BX21 without function Any BX21 connected but not defined - define parameters for this sensor connected to the AGU2.5 extension module.
336 Sensor input BX22 without function Any BX22 connected but not defined - define parameters for this sensor connected to the AGU2.5 extension module.
353 Cascade flow sensor B10 missing Any Check connections and configuration of common flow temperature sensor (B10), which is located at the feed into the tank on the front, left, mid section of the appliance.
384 Extraneous light Any Ionisation current detected before ignition. Check ionisation current (“Diagnostics producer” parameter 8329). If there is a current present whilst the burner is in standby, turn off gas supply to check gas valve is closing completely. If current is still present, remove ionisation probe and use a screwdriver to clear the opening through the heat engine door before replacing the probe.
385 Mains under voltage Any Mains voltage below 185v - check electrical supply to the appliance.
386 Fan speed tolerance Any Fan outside allowed speed tolerance level. Check all wiring. Check for possible air or flue restriction. Replace fan if all airways are clear and wiring is good.
432 Function earth not connected Any No Ignition earth, X1 / X17 not connected or earth fault.
NA Operating mode button locked - Cannot operate in DHW mode (No fault displayed) Any Remote system enable operating. Check to see if link wire is still in place or controls wired to these terminals are closing this circuit. When the appliance is operating via the volt free enable signal, it is not possible to operate the appliance manually via the GUI if the signal is not enabled (circuit closed).

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