Combi Compact And Thermocompact Logical Fault Finding

HEATING,CONTROLS,HOT WATER.

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Contents
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Guidance Notes
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Room Sealed Fan Flued Models (RSF) COMBlcompact VCW 242E, 282E THERMOcompact VC112E, 142E, 182E, 242E, 282E

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Balanced Flue & Open Flue Models COMBlcompact VCW221, 240, 280 THERMOcompact VC110, 180, 240, 221.

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Guidance Notes (should be read before using this fault finding guide)
1. Check you are using correct guide for your appliance. See index and check model number. 2.Always start at the beginning of guide and work through one step at a time. 3.AII guides deal with central heating (C/htg) first, then hot water (D.HW.) Do the same when followingguides. 4. When checking 240v AC mains voltage use terminal 1 on appliance terminal strip as the neutral test point. 6.ln order to use this fault finding guide ensure that the operating mode of circulating pump is set to operating mode (I) (selector plug adjacent to appliance terminal strip makes electrical connection to contact one) see diagram. T

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5. When checking D.C.voltage use terminal 9 on appliance terminal strip as the negative test point. (All D.C. voltages are low voltage).

7. Note that illustrations and pictures are shown only once and are not duplicated again in this guide. Each illustration/picture has been given a reference number.

FRONT CONTROL PANEL Key 1. Yellow neon indicating power to operator. 2. Green neon indicating operation ofDiaphragm pump. As voltage decreases to diaphragm pump so neon loses luminosity. 3. 0.16 amp anti surge fuse. 4. Time delay adjustment (factory set 5 minutes, adjustable 1-12 minutes). 5. Fault suppression button (ignition lockout). 6. Indicating neon (lockout). 7. 2 x 2 amp fuses (L&N). 8. Variable potentiometer controlling central heating flow temperature only. 9. Red neon rocker switch for power on.10. Central heating rocker switch (not fitted on VC appliances) .

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Note 1 It is law* that any work carried out on a gas appliance must be carried out by a competent person who is registered with CORGI (Council for Registered Gas Installers). Note 2 All work involving electricity must be carried out by a competent person who is responsible for electrical safetychecks. *Gas Safety (Installations and Use) Regulations 1984 Gas Safety (Installations and Use) Amendment Regulation 1990

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Room Sealed Fan Flued Models (RSF)

guidance note 6)

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(c) Check appliance not in time delay (isolate power,wait 5 seconds and restore). (d) Check anti surge fuse (0.16 amp).

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(a) Check 240v AC across pump terminals T Pic10

(b) Check pump free to rotate and not stuck T Pic11 ~.

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and (b) are OK.- change

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pump.

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Check hydraulic operation OK ?1. Hydraulic diverter valve moves left closes microswitch M2 (VCW only)

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(a) Check appliance and system full, pressurised and vented of air. (b) Check servo valve is in C/htg position, return spring holds carn down (VCW only). T Pic 12

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(c) Check for dirt, sludge, flux or inhibitorcausTng frothing in system affecting:1. Pump performance 2. Hydraulic diverter valve (VCW only) 3.Servo valve (VCW only) 4. Connecting tubes 5. Main heat exchanger 6. Differential valve

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2. Differential valve opens. T Pic 14

Rear view

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Does applianC1 ignition? T

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(a) Check microswitchM2 (20v DC) is making contact and closed circuit(VCW only). T Pic 15

(d) Check combustion...